,,steam ,,steel ,,and ,,electricity ,by ,,james ,w4 ,,steele ,,contents ,,the ,,story ,,of ,,steam4 ,what ,steam is4--,steam in ,nature4--,the ,engine in its earlier forms4--,gradual explosion4--,the ,hero engine4--,the ,temple-door machine4--,ideas of the ,middle ,ages4--,beginnings of the modern engine4--,branca's engine4--,savery's engine4--,the ,papin engine using cylinder and piston4--,watt's improvements upon the ,newcomen idea4--,the crank movement4--,the first use of steam expansively4--,the ,governor4--,first engine by an ,american ,inventor4--,its effect upon progress in the ,united ,states4--,simplicity and cheapness of the modern engine4--,actual construction of the modern engine4--,valves1 piston1 etc41 with diagrams4 ,,the ,,age ,,of ,,steel4 ,the various ,ages in civilization4--,ancient knowledge of the metals4--,the invention and use of ,bronze4--,what ,steel is4--,the ,lost ,arts4--,metallurgy and chemistry4--,oriental ,steel4--,modern definition of ,steel4--,invention of ,cast ,steel4--,first iron-ore discoveries in ,america4--,first ,american ,iron-works4--,early methods without steam4--,first ,american casting4--,effect of iron industry upon independence4--,water-power4--,the trip-hammer4--,the steam-hammer of ,nasmyth4--,machine-tools and their effects4--,first rolling-mill4--,product of the iron industry in #ahdj-ej4--,the modern nail1 and how it came4--,effect of iron upon architecture4--,the ,sky-,scraper4--,gas as fuel in iron manufactures4--,the ,steel of the present4--,the invention of ,kelley4--,the ,bessemer process4--,the ,converter4--,present product of ,steel4--,the ,steel-mill4 ,,the ,,story ,,of ,,electricity4 ,the oldest and the youngest of the sciences4--,origin of the name4--,ancient ideas of ,electricity4--,later experiments4--,crude notions and wrong conclusions4--,first ,electric ,machine4--,frictional ,electricity4--,the ,leyden ,jar4--,extreme ideas and ,fakerism4--,franklin1 his new ideas and their reception4--,franklin's ,kite4--,the ,man ,franklin4--,experiments after ,franklin1 leading to our present modern uses4--,galvani and his discovery4--,volta1 and the first ,battery4--,how a battery acts4--,the laws of ,electricity1 and how they were discovered4--,induction1 and its discoverer4--,the line at which modern ,electricity begins4--,magnetism and ,electricity4--,the ,electro-,magnet4--,the ,molecular theory4--,faraday1 and his ,law of ,magnetic ,force4 ,,modern ,,electricity4 ,,chapter ,i4 ,the ,four great qualities of ,electricity which make its modern uses possible4--,the universal wire4--,conductors and non conductors4--,electricity an exception in the ordinary ,laws of ,nature4--,a dual nature3 ,positive and ,negative4--,all modern uses come under the law of ,induction4--,some of the laws of this induction4--,magnets and ,magnetism4--,relationship between the two4--,magnetic poles4--,practical explanation of the action of induction4--,the ,induction ,coil4--,dynamic and ,static ,electricity4--,the ,electric ,telegraph4--,first attempts4--,morse1 and his beginnings4--,the first ,telegraph ,line4--,vail1 and the invention of the dot-and-dash alphabet4--,the old instruments and the new4--,the final simplicity of the telegraph4 ,,chapter ,,ii4 ,the ,ocean ,cable4--,differences between land lines and cables4--,the story of the first cable4--,field and his final success4--,the ,telephone4--,early attempts4--,description of ,bell's invention4--,the ,telautograph4--,early attempts and the idea upon which they were based4--,description of ,gray's invention4--,how a ,telautograph may be made mechanically4 ,,chapter ,,iii4 ,the ,electric ,light4--,causes of heat and light in the conductor of a current4--,the first ,electric ,light4--,the ,arc ,light1 and how constructed4--,the ,incandescent4--,the ,dynamo4--,date of the invention4--,successive steps4--,faraday the discoverer of its principle4--,pix's machine4--,pacinatti4--,wilde4--,siemens ' and ,wheatstone4--,the ,motor4--,how the ,dynamo and ,motor came to be coupled4--,review of first attempts4--,kidder's battery4--,page's machine4--,electric ,railroads4--,electrolysis4--,general facts4--,electrical ,measurements4--,death ,current4--,instruments of ,measurement4--,electricity as an ,industry4--,medical ,electricity4--,incomplete possibilities4--,what the ,storage ,battery is4 ,,chapter ,,iv4 ,electrical ,invention in the ,united ,states4--,review of the careers of ,franklin1 ,morse1 ,field1 ,edison and others4--,some of the surprising applications of ,electricity4--,the ,range-,finder4--,cooking and heating by ,electricity4 ,,the ,,story ,,of ,,steam ,that which was utterly unknown to the most splendid civilizations of the past is in our time the chief power of civilization1 daily engaged in making that history of a new era that is yet to be written in words4 ,it has been demonstrated long since that men's lives are to be influenced not by theory1 or belief1 or argument and reason1 so much as by that course of daily life which is not attempted to be governed by argument and reason1 but by great physical facts like steam1 electricity and machinery in their present applications4 ,the greatest of these facts of the present civilization are expressed in the phrase1 ,steam and ,steel4 ,the theme is stupendous4 ,only the most prominent of its facts can be given in small space1 and those only in outline4 ,the subject is also old1 yet to every boy it must be told again1 and the most ordinary intelligence must have some desire to know the secrets1 if such they are1 of that which is unquestionably the greatest force that ever yielded to the audacity of humanity4 ,it is now of little avail to know that all the records that men revere1 all the great epics of the world1 were written in the absence of the characteristic forces of modern life4 ,a thousand generations had lived and died1 an immense volume of history had been enacted1 the heroes of all the ages1 and almost those of our own time1 had fulfilled their destinies and passed away1 before it came about that a mere physical fact should fill a larger place in our lives than all examples1 and that the evanescent vapor which we call steam should change daily1 and effectively1 the courses and modes of human action1 and erect life upon another plane4 ,it may seem not a little absurd to inquire now what is steam8 ,everybody knows the answer4 ,the non-technical reader knows that it is that vapor which1 for instance1 pervades the kitchen1 which issues from every cooking vessel and waste-pipe1 and is always white and visible1 and moist and warm4 ,we may best understand an answer to the question1 perhaps1 by remembering that steam is one of the three natural conditions of water3 ice1 fluid water1 and steam4 ,one or the other of these conditions always exists1 and always under two others3 pressure and heat4 ,when the air around water reaches the temperature of thirty-two degrees by the scale of ,fahrenheit1 or or zero by the ,centigrade scale1 and is exposed to this temperature for a time1 it becomes ice4 ,at two hundred and twelve degrees ,fahrenheit it becomes steam4 ,between these two temperatures it is water4 ,but the change to steam which is so rapid and visible at the temperature above mentioned is taking place slowly all the time when water1 in any situation1 is exposed to the air4 ,as the temperature rises the change becomes more rapid4 ,the steam-making of the arts is merely that of all nature1 hastened artificially and intentionally4 ,the element of pressure1 mentioned above1 enters into the proposition because water boils at a lower temperature1 with less heat1 when the weight of the atmosphere is less than normal1 as it is at great elevations1 and on days when1 as we now express it1 there is a low barometer4 ,long before any cook could explain the fact it was known that the water boiling quickly was a sign of storm4 ,it has often been found by camping-parties on mountains that in an attempt to boil potatoes in a pot the water would all boil away1 and leave the vegetables uncooked4 ,the heat required to evaporate it at the elevation was less than that required to cook in boiling water4 ,it is one of the instances where the problems of nature intrude themselves prominently into the affairs of common life without previous notice4 ,this universal evaporation1 under varying circumstances1 is probably the most important agency in nature1 and the most continuous and potent4 ,there was only so much water to begin with4 ,there will never be any less or any more4 ,the saltness of the sea never varies1 because the loss by evaporation and the new supply through condensation of the steam--rain--necessarily remain balanced by law forever4 ,the surface of our world is water in the proportion of three to one4 ,the extent of nature's steam-making1 silent1 and mostly invisible1 is immeasurable and remains an undetermined quantity4 ,the three forms of water combine and work together as though through intentional partnership1 and have1 thus combined1 already changed the entire land surface of the world from what it was to what it is1 and working ceaselessly through endless cycles will change it yet more4 ,the exhalations that are steam become the water in a rock-cleft4 ,it changes to ice with a force almost beyond measurement in the orderly arrangement of its crystals in compliance with an immutable law for such arrangement1 and rends the rock4 ,the process goes on4 ,there is no high mountain in any land where water will not freeze4 ,the water of rain and snow carries away the powdered remains from year to year1 and from age to age4 ,the comminuted ruins of mountains have made the plains and filled up and choked the mouth of the ,mississippi4 ,the soil that once lay hundreds of miles away has made the delta of every river that flows into the sea4 ,the endless and resistless process goes on without ceasing1 a force that is never expended1 and but once interrupted within the knowledge of men1 then covered a large area of the world with a sea of ice that buried for ages every living thing4 ,the common idea of the steam that we make by boiling water is that it is all water1 composed of that and nothing else1 and this conception is gathered from apparent fact4 ,yet it is not entirely true4 ,steam is an invisible vapor in every boiler1 and does not become what we know by sight as steam until it has become partly cooled4 ,as actual steam uncooled1 it is a gas1 obeying all the laws of the permanent gases4 ,the creature of temperature and pressure1 it changes from this gaseous form when their conditions are removed1 and in the change becomes visible to us4 ,its elasticity1 its power of yielding to compression1 are enormous1 and it gives back this elasticity of compression with almost inconceivable readiness and swiftness4 ,to the eye1 in watching the gliding and noiseless movements of one of the great modern engines1 the power of which one has only a vague and inadequate conception seems not only inexplicable1 but gentle4 ,the ponderous iron pieces seem to weigh nothing4 ,there is a feeling that one might hinder the movement as he would that of a watch4 ,there is an inability to realize the fact that one of the mightiest forces of nature is there embodied in an easy1 gliding1 noiseless impulse4 ,yet it is one that would push aside massy tons of dead weight1 that would almost unimpeded crush a hole through the enclosing wall1 that whirls upon the rails the drivers of a locomotive weighing sixty tons as though there were no weight above them1 no bite upon the rails4 ,there is an enormous concentration of force somewhere2 of a force which perhaps no man can fairly estimate2 and it is under the thin shell we call a boiler4 ,were it not elastic it could not be so imprisoned1 and when it rebels1 when this thin shell is torn like paper1 there is a havoc by which we may at last inadequately measure the power of steam4 ,we have in modern times applied the word engine almost exclusively to the machine which is moved by the pressure of steam4 ,yet we might go further1 since one of the first examples of a pressure engine1 older than the steam machine by nearly four hundred years1 is the gun4 ,reduced to its principle this is an engine whose operation depends upon the expansion of gas in a cylinder1 the piston being a projectile4 ,the same principle applies in all the machines we know as engines4 ,an air-engine works through the expansion of air in a cylinder by heat4 ,a gas-engine1 now of common use1 by the expansion1 which is explosion1 caused by burning a mixture of coal-gas and air1 and the steam-engine1 the universal power generator of modern life1 works by the expansion of the vapor of water as it is generated by heat4 ,steam may be considered a species of gradual explosion applied to the uses of industry4 ,it often becomes a real one1 complying with all the conditions1 and as destructive as dynamite4 ,it cannot be certainly known how long men have experimented with the expansive force of steam4 ,the first feeble attempt to purloin the power of the geyser was probably by ,hero1 of ,alexandria1 about a hundred and thirty years before ,christ4 ,his machine was also the first known illustration of what is now called the turbine principle2 the principle of reaction in mechanics4 ,footnote3 ,this principle is often a puzzle to students4 ,there is an old story of the man who put a bellows in his boat to make wind against the sail1 and the wind did not affect the sail1 but the boat went backward in an opposite direction from the nozzle of the bellows4 ,there is probably no better illustration of reaction than the kick of a gun1 which most persons know about4 ,the recoil of a six-pound field piece is usually from six to twelve feet4 ,it can be understood by supposing a gun to be loaded with powder and an iron rod longer than the barrel to be left on the charge4 ,if the outer end of this rod were then placed against a tree1 and the gun were fired1 it is manifest that the gun would become the projectile1 and be fired off of the rod backward or burst4 ,in ordinary cases the air in the bore1 and immediately outside of the muzzle1 acts comparatively1 and in a measure1 as the supposed rod against the tree would4 ,it gives way1 and is elastic1 but not as quickly as the force of the explosion acts1 and the gun is pushed backwards4 ,it is the turbine principle1 running into hundreds of uses in mechanics4 ,he made a closed vessel from whose opposite sides radiated two hollow arms with holes in their sides1 the holes being on opposite sides of the tubes from each other4 ,this vessel he mounted on an upright spindle1 and put water in it and heated the water4 ,the steam issuing from the holes in the arms drove them backward4 ,the principle of the action of ,hero's machine has been accepted for two thousand years1 though never in a steam-engine4 ,it exists under all circumstances similar to his4 ,in water1 in the turbine wheel1 it has been made most efficacious4 ,the power applied now for the harnessing of ,niagara for the purpose of sending electric currents hundreds of miles is the turbine wheel4 ,illustration3 ,,the ,,supposed ,,hero ,,engine4 ,hero appears to the popular imagination as the greatest inventor of the past4 ,every school boy knows him4 ,archimedes1 the ,greek1 was the greater1 and a hundred and fifty years the earlier1 and was the author of the significance of the word ,eureka1 as we use it now4 ,but ,hero was the pioneer in steam4 ,he made the first steam-engine1 and is immortal through a toy4 ,the first practical device in which expansion was used seems to have been for the exploiting of an ecclesiastical trick intended to impress the populace4 ,there is a saying by an antique wit that no two priests or augurs could ever meet and look at each other without a knowing wink of recognition4 ,hero is said to have been the author of this contrivance also4 ,the temple doors would open by themselves when the fire burned on the altar1 and would close again when that fire was extinguished1 and the worshippers would think it a miracle4 ,it is interesting because it contained the principle upon which was afterwards attempted to be made the first working low-pressure or atmospheric steam-engine4 ,yet it was not steam1 but air1 that was used4 ,a hollow altar containing air was heated by the fire being kindled upon it4 ,the air expanded and passed through a pipe into a vessel below containing water4 ,it pressed the water out through another pipe into a bucket which1 being thereby made heavier1 pulled open the temple doors4 ,when the fire went out again there was a partial vacuum in the vessel that had held the water at first1 and the water was sucked back through the pipe out of the bucket4 ,that became lighter again and allowed the doors to close with a counter-weight4 ,all that was then necessary to convince the populace of the genuineness of the seeming miracle was to keep them from understanding it4 ,the machinery was under the floor4 ,there have been thousands of miracles since then performed by natural agencies1 and there have passed many ages since ,hero's machine during which not to understand a thing was to believe it to be supernatural4 ,illustration3 ,,the ,,temple-,,door ,,trick4 ,from the time of ,hero until the seventeenth century there is no record of any attempt being made to utilize steam-pressure for a practical purpose4 ,the fact seems strange only because steam-power is so prominent a fact with ourselves4 ,the ages that intervened were1 as a whole1 times of the densest superstition4 ,the human mind was active1 but it was entirely occupied with miracle and semi-miracle2 in astrology1 magic and alchemy2 in trying to find the key to the supernatural4 ,every thinker1 every educated man1 every man who knew more than the rest1 was bent upon finding this key for himself1 so that he might use it for his own advantage4 ,during all those ages there was no idea of the natural sciences4 ,the key they lacked1 and never found1 that would have opened all1 is the fact that in the realm of science and experiment there is no supernatural1 and only eternal law2 that cause produces its effect invariably4 ,even ,kepler1 the discoverer of the three great laws that stand as the foundation of the ,copernican system of the universe1 was in his investigations under the influence of astrological and cabalistic superstitions4 ,footnote3 ,kepler1 a ,german1 lived between #aega and #afcj4 ,his life was full of vicissitudes1 in the midst of which he performed an astonishing ,even the science of amount of intellectual labor1 with lasting results4 ,he was the personal friend of ,galileo and ,tycho ,brahe1 and his life may be said to have been spent in finding the abstract intelligible reason for the actual disposition of the solar system1 in which physical cause should take the place of arbitrary hypothesis4 ,he did this4 medicine was1 during those ages1 a magical art1 and the idea of cure by medicine1 that drugs actually cure1 is existent to this day as a remnant of the ,middle ,ages4 ,a man's death-offense might be that he knew more than he could make others understand about the then secrets of nature4 ,yet he himself might believe more or less in magic4 ,no one was untouched2 all intellect was more or less enslaved4 ,and when experiments at last began to be made in the mechanisms by which steam might be utilized they were such as boys now make for amusement2 such as throwing a steam-jet against the vanes of a paddle-wheel4 ,such was ,branca's engine1 made nine years after the landing of our forefathers at ,plymouth1 and thought worthy of a description and record4 ,the next attempt was much more practical1 but cannot be accurately assigned4 ,it consisted of two chambers1 from each of which alternately water was forced by steam1 and which were filled again by cooling off and the forming of a vacuum where the steam had been4 ,one chamber worked while the other cooled4 ,it was an immense advance in the direction of utility4 ,about #afih1 we begin to encounter the names that are familiar to us in connection with the history of the steam-engine4 ,in that year ,thomas ,savery obtained a patent for raising water by steam4 ,his was a modification of the idea described above4 ,the boilers used would be of no value now1 nevertheless the machine came into considerable use1 and the world that learned so gradually became possessed with the idea that there was a utility in the pressure of steam4 ,savery's engine is said to have grown out of the accident of his throwing a flask containing a little wine on the fire at a tavern4 ,concluding immediately afterwards that he wanted it1 he snatched it off of the fender and plunged it into a basin of water to cool it4 ,the steam inside instantly condensing1 the water rushed in and filled it as it cooled4 ,we now come to the beginning of the steam engine as we understand the term2 the machine that involves the use of the cylinder and piston4 ,these two features had been used in pumps long before1 the atmospheric pump being one of the oldest of modern machines4 ,the vacuum was known and utilized long before the cause of it was known4 ,footnote3 ,the discoverer was an ,italian1 ,torricelli1 about #afdc4 ,gallileo1 his tutor and friend1 did not know why water would not rise in a tube more than thirty-three feet4 ,no one knew of the weight of the atmosphere1 so late as the early days of this republic4 ,many did not believe the theory long after that time4 ,torricelli1 by his experiments1 demonstrated the fact and invented the mercurial barometer1 long known as the ,torricellian ,tube4 ,this last instrument led to another discovery2 that the weight of the atmosphere varied from time to time in the same locality1 and that storms and weather changes were indicated by a rising and falling of the column of mercury in the tube of the siphon-barometer4 ,that which we call the weather-bureau1 organized by ,general ,albert ,j4 ,myer1 ,united ,states ,army1 in #ahgj1 and growing out of the army signal service1 of which he was chief1 makes its forecasts by the use of the telegraph and the barometer4 ,the low pressure area follows a path1 which means a change of weather on that path4 ,notices by telegraph define the route1 and the coming storm is not foretold1 but foreknown2 not prophesied1 but ascertained4 ,if we have been led from the crude pump of ,gallileo's time directly to the weather bureau of the present with its invaluable signals to sailors and convenience to everybody1 it is no more than is continually to be traced even to the beginning of the wonderful school of modern science4 ,but in the beginning it was not proposed to use steam in connection with the cylinder and piston which now really constitutes the steam-engine4 ,reverting again to the example of the gun1 it was suggested to push a piston forward in a tube by the explosion of gunpowder behind it1 or to repeat the ,savery experiment with powder instead of steam4 ,these ideas were those of about #afgh-afhe4 ,the very earliest cylinder and piston engine was suggested by ,denis ,papin in #afij4 ,these early inventors only went a portion of the way1 and almost the entire idea of the steam-engine is of much later date4 ,mankind had then a singular gift of beginning at the wrong end4 ,every inventor now uses facts that seem to him to have been always known1 and that are his by a kind of intuition4 ,but they were all acquired by the tedious experience of a past that is distinguished by a few great names whose owners knew in their time perhaps one-tenth part as much as the modern inventor does1 who is unconsciously using the facts learned by old experience4 ,but the others began at the beginning4 ,illustration3 ,,early ,,newcomen ,,pumping ,,engine4 ,,steam-,,cock1 ,,cold ,,water ,,cock ,,and ,,waste-,,spigot ,,all ,,worked ,,by ,,hand4 ,in #agaa1 almost a hundred years after the arrival at ,jamestown and ,plymouth of the fathers of our present civilization1 the steam-engine that is called ,newcomen's began to be used for the pumping of water out of mines4 ,this engine1 slightly modified1 and especially by the boy who invented the automatic cut-off for the steam valves1 was a most rude and clumsy machine measured by our ideas4 ,there appears to have been scarcely a single feature of it that is now visible in a modern engine4 ,the cylinder was always vertical4 ,it had the upper end open1 and was a round iron vessel in which a plunger moved up and down4 ,steam was let in below this plunger1 and the walking-beam with which it was connected by a rod had that end of it raised4 ,when raised the steam was cut off1 and all that was then under the piston was condensed by a jet of cold water4 ,the outside air-pressure then acted upon it and pushed it down again4 ,in this down-stroke by air-pressure the work was done4 ,the far end of the walking-beam was even counter-weighted to help the steam-pressure4 ,the elastic force of compressed steam was not depended upon1 was hardly even known1 in this first working and practical engine of the world4 ,every engine of that time was an experimental structure by itself4 ,the boiler1 as we use it1 was unknown4 ,often it was square1 stayed and braced against pressure in a most complicated way4 ,yet the ,newcomen engine held its place for about seventy-five years2 a very long time in our conception1 and in view of the vast possibilities that we now know were before the science4 ,footnote3 ,as late as #ahhj1 the steam-engine illustrated and described in the natural philosophy text books was still the ,newcomen1 or ,newcomen-,watt engine1 and this while that engine was almost unknown in ordinary circumstances1 and double-acting high-pressure engines were in operation everywhere4 ,this last1 without which not much could be done that is now done1 was evidently for a long time after it came into use regarded as a dangerous and unphilosophical experiment1 hardly scientific1 and not destined to be permanently adopted4 ,in the year #agfj1 ,james ,watt1 who was by occupation what is now known as a model-maker1 and who lived in ,glasgow1 was called upon to repair a model of a ,newcomen engine belonging to the university4 ,while thus engaged he was impressed with the great waste of steam1 or of time and fuel1 which is the same thing1 involved in the alternate heating and cooling of ,newcomen's cylinder4 ,to him occurred the idea of keeping the cylinder as hot as the steam used in it4 ,watt was therefore the inventor of the first of those economies now regarded as absolute requirements in construction4 ,he made the first steam-jacket1 and was1 as well1 the author of the idea of covering the cylinder with a coat of wood1 or other non-conductor4 ,he contrived a second chamber1 outside of the cylinder1 where the then indispensable condensation should take place4 ,then he gave this cylinder for the first time two heads1 and let out the piston-rod through a hole in the upper head1 with packing4 ,he used steam on the upper side of the piston as well as the lower1 and it will be seen that he came very near to making the modern engine4 ,yet he did not make it4 ,he was still unable to dispense with the condensing and vacuum and air-pressure ideas4 ,acting for the first time in the line of real efficiency1 he failed to go far enough to attain it4 ,he made a double-acting engine by the addition of many new parts2 he even attained the point of applying his idea to the production of circular motion4 ,but he merely doubled the ,newcomen idea4 ,his engine became the ,newcomen-,watt4 ,he had a condensing chamber at each end of the stroke and could therefore command a reciprocating movement4 ,the walking-beam was retained1 not for the purpose for which it is often used now1 but because it was indispensable to his semi-atmospheric engine4 ,illustration3 ,,the ,,perfected ,,newcomen-,,watt ,,engine4 ,it may seem almost absurd that the universal crank-movement of an engine was ever the subject of a patent4 ,yet such was the case4 ,a man named ,pickard anticipated ,watt1 and the latter then applied to his engines the sun-and-planet movement1 instead of the crank1 until the patent on the latter expired4 ,the steam-engine marks the beginning of a long series of troubles in the claims of patentees4 ,in #aghb came ,watt's last steam invention1 an engine that used steam expansively4 ,this was an immense stride4 ,he was also at the same time the inventor of the throttle1 or choke valve1 by which he regulated the supply of steam to the piston4 ,it seems a strange thing that up to this time1 about #agfg1 an engine in actual use was started by getting up steam enough to make it go1 and waiting for it to begin1 and stopped by putting out the fire4 ,then he invented the governor1 a contrivance that has scarcely changed in form1 and not at all in action1 since it was first used1 and is one of the few instances of a machine perfect in the beginning4 ,two balls hang on two rods on each side of an upright shaft1 to which the rods are hinged4 ,the shaft is rotated by the engine1 and the faster it turns the more the two balls stand out from it4 ,the slower it turns the more they hang down toward it4 ,any one can illustrate this by whirling in his hands a half-open umbrella4 ,there is a connection between the movement of these balls and the throttle2 as they swing out more they close it1 as they fall closer to the shaft they open it4 ,the engine will therefore regulate its own speed with reference to the work it has to do from moment to moment4 ,illustration3 ,,the ,,governor4 ,through all these changes the original idea remained of a vacuum at the end of every stroke1 of indispensable assistance from atmospheric pressure1 of a careful use of the direct expansive power of steam1 and of the avoidance of the high pressures and the actual power of which steam is now known to be safely capable4 ,footnote3 ,in a reputable school philosophy printed in #ahhj1 thus3 ,in some engines 7describing the modern high-pressure engine1 universal in most land service7 the apparatus for condensing steam alternately above and below the piston is dispensed with1 and the steam1 after it has moved the piston from one end of the cylinder to the other1 is allowed to escape1 by the opening of a valve1 directly into the air4 ,to accomplish this it is evident that the steam must have an elastic force greater than the pressure of the air1 or it could not expand and drive out the waste steam on the other side of the piston1 in opposition to the pressure of the air4 ,according to this teaching1 which the young student is expected to understand and to entirely believe1 a pressure of steam of1 say eighty to a hundred and twenty pounds to the inch on one side of the piston is accompanied by an absolute vacuum there1 which permits the pressure of the outside air to exert itself against the opposite side of the piston through the open port at the other end of the cylinder4 ,that is1 a state of things which would exist if the steam behind the piston were suddenly condensed1 exists anyway4 ,if it be true the facts should be more generally known2 if not1 most of the school philosophies need reviewing4 ,then an almost unknown ,american came upon the scene4 ,in ,english hands the story at once passes from this point to the experiments of ,trevethick and ,george ,stevenson with steam as applied to railway locomotion4 ,but as ,watt left it and ,trevethick found it1 the steam engine could never have been applied to locomotion4 ,it was slow1 ponderous1 complicated and scientific1 worked at low pressures1 and ,watt and his contemporaries would have run away in affright from the innovation that came in between them and the first attempts of the pioneers of the locomotive4 ,this innovation was that of ,evans1 the ,american1 of whom further presently4 ,the first steam-engine ever built in the ,united ,states was probably of the ,watt pattern1 in #aggc4 ,in #aggf1 the year of beginning for ourselves1 there were only two engines of any kind in the colonies2 one at ,passaic1 ,n4 ,j41 the other at ,philadelphia4 ,we were full of the idea of the independence we had won soon afterwards1 but in material respects we had all before us4 ,in #aghg1 ,oliver ,evans introduced improvements in grain mills1 and was generally efficient as one of the beginners in the field of ,american invention4 ,soon afterwards he is known to have made a steam-engine which was the first high-pressure double-acting engine ever made4 ,the engine that used steam at each end of the cylinder with a vacuum and a condenser1 was in this first instance1 so far as any record can be found1 supplanted by the engine of to-day4 ,the reason of the delay it is difficult to account for on any other grounds than lack of boldness1 for unquestionably the early experimenters knew that such an engine could be made4 ,they were afraid of the power they had evoked4 ,such a machine may have seemed to them a willful toying with disaster4 ,their efforts were bent during many years toward rendering a treacherous giant useful1 yet entirely harmless4 ,their boilers1 greatly improved over those ,i have mentioned1 never were such as were afterwards made to suit the high pressures required by the audacity of ,hopkins4 ,this audacity was the mother of the locomotive1 and of that engine which almost from that date has been used for nearly every purpose of our modern life that requires power4 ,the ,american innovation may have passed unnoticed at the time1 but intentionally or otherwise it was imitated as a preliminary to all modern engines4 ,nearly a century passed between the making of the first practical engine and that one which now stands as the type of many thousands4 ,but now every little saw-mill in the ,american woods could have1 and finally did have1 its little cheap1 unscientific1 powerful and non-vacuum engine1 set up and worked without experience1 and maintained in working order by an unskilled laborer4 ,a thousand uses for steam grew out of this experiment of a ,yankee who knew no better than to tempt fate with a high-pressure and speed and recklessness that has now become almost universal4 ,there was with ,watt and his contemporaries apparently a fondness for cost and complications4 ,most likely the finished ,watt engine was a handsome and stately machine1 imposing in its deliberate movements4 ,there is apparently nothing simpler than the placing of the head of the piston-rod between two guide-pieces to keep it in line and give it bearing4 ,yet we have only to turn back a few years and see the elaborate and beautiful geometrical diagram contrived by ,watt to produce the same simple effect1 and known as a parallel motion4 ,it kept its place until the walking-beam was cast away1 and the ,american horizontal engine came into almost universal use4 ,the object of this chapter so far has been to present an idea of beginnings2 of the evolution of the universal and indispensable machine of civilization4 ,the steam-engine has given a new impetus to industry1 and in a sense an added meaning to life4 ,it has made possible most that was ever dreamed of material greatness4 ,it has altered the destiny of this nation1 and other nations1 made greatness out of crude beginnings1 wealth out of poverty1 prosperity upon thousands of square miles of uninhabitable wilderness4 ,it was the chiefest instrumentality in the widening of civilization1 the bringing together of alien peoples1 the dissemination of ideas4 ,electricity may carry the idea2 steam carries the man with the idea4 ,the crude misconceptions of old times existed naturally before its time1 and have largely vanished since it came4 ,marco ,polo and ,mandeville and their kind are no longer possibilities4 ,applied to transportation1 locomotion alone1 its effects have been revolutionary4 ,applied to common life in its minute ramifications these effects could not have been believed or foretold1 and are incredible4 ,the thought might be followed indefinitely1 and it is almost impossible to compare the world as we know it with the world of our immediate ancestors4 ,only by means of contrasts1 startling in their details1 can we arrive at an adequate estimate1 even as a moral farce1 of the power of steam as embodied in the modern engine in a thousand forms4 99 99 99 99 99 ,perhaps it might be well to attempt to convey1 for the benefit of the youngest reader1 an idea of the actual working of the machine we call a steam-engine4 ,there are hundreds of forms1 and yet they are all alike in essentials4 ,to know the principle of one is to know that of all4 ,there is probably not an engine in the world in effective common use--the odd and unusual rotary and other forms never having been practical engines--that is not constructed upon the plan of the cylinder and piston4 ,these two parts make the engine4 ,if they are understood only differences in construction and detail remain4 ,imagine a short tube into which you have inserted a pellet1 or wad of any kind1 so that it fits tolerably1 yet moves easily back and forth in the bore of the tube4 ,if this pellet or wad is at one end of the tube you may1 by inserting that end in your mouth and putting air-pressure upon it1 make it slide to the other end4 ,you do not touch it with anything2 you may push it back and forth with your breath as many times as you wish1 not by blowing against it1 so to speak1 but by producing an actual air-pressure upon it which is confined by the sides of the tube and cannot go elsewhere4 ,the only pressure necessary is enough to move the pellet4 ,now1 if you push this little pellet one way by the air-pressure from your mouth1 and then1 instead of reversing the tube in the mouth and pushing it back again in the same way1 reverse the process and suck the air out from behind it1 it comes back by the pressure of the outside atmosphere4 ,this was the way the first steam engines worked4 ,their only purpose was to get the piston lifted1 and air-pressure did all the actual work4 ,if you turn the tube1 and put an air-pressure first at one end and then at the other1 and pay no attention to vacuum or atmospheric pressure1 you will have the principle of the later modern1 almost universal1 high-pressure1 double-acting steam-engine4 ,but now you must imagine that the tube is fixed immovably1 and that the air-pressure is constant in a pipe leading to the tube1 and yet must be admitted first to one end of the tube and then to the other alternately1 in order to push the pellet back and forth in it4 ,it seems simple4 ,perhaps the young reader can find a way to do it1 but it required about a hundred years for ingenious men to find out how to do precisely the same thing automatically4 ,it involves the steam-chest and the slide-valve1 and all other kinds of steam valves that have been invented1 including the ,corliss cut-off1 and all others that are akin to it in object and action4 ,but now imagine the tube closed at each end to begin with1 and the little moving pellet1 or plunger1 on the inside4 ,to get the air into both ends of the tube alternately1 and to use its pressure on each side of the pellet1 we will suppose that the air-pipe is forked1 and that one end of each fork is inserted into the side of the tube near the end1 like the figure below1 and imagine also that you have put a finger over each end of the tube4 ,illustration3 ,fig4 #a ,we are now getting the air-pressure through the pipe in both ends of the tube alike1 and do not move the pellet either way4 ,to make it move we must do something more1 and open one end of the tube1 and close that fork of the air-pipe1 and thus get all the pressure on one side of the pellet4 ,remove one finger from the end of the tube1 and pinch the fork of the air-tube that is on that side4 ,the pellet will now move toward that end of the tube which is open4 ,reverse the process1 and it can be pushed back again with air-pressure to the other end1 and so on indefinitely4 ,let us improve the process4 ,we will close each end of the tube permanently1 and insert four cocks in the tube and forked pipe4 ,we have here two tubes inserted at each end of the large tube1 and in each of these is a cock4 ,we have each cock connected by a rod to the lever set on a pin in the middle of the tube4 ,we must have these cocks so arranged that when the lever is moved 7say7 to the right1 ,a4 is opened and ,b4 is closed1 and ,d4 is opened and ,c4 is closed4 ,now if the air-pressure is constant through the forked air-tube1 and the cock ,e4 is open1 if the top of the lever is moved to the right1 the pellet will be pushed to the left in the large tube4 ,if the lever is moved to the left1 and the two cocks that were open are closed1 and the two that were closed are opened again1 the pellet will be sent back to the other end of the tube4 ,this movement of the pellet in the tube will occur as often as the lever is moved and there is any air-pressure in the forked tube4 ,there is a supply-cock1 opened and an escape-cock closed1 and an escape-cock opened and a supply-cock closed1 at each end of the tube1 every time the lever is moved4 ,illustration3 ,fig4 #b ,we are using air instead of steam1 and the movement of these four cocks all at the same time1 and the result of moving them1 is precisely that of the slide-valve of a steam-engine4 ,the diagrams of this slide-valve would be difficult to understand4 ,the action of the cocks can be more readily understood1 and the result1 and even much of the action1 is precisely the same4 ,but to make the arrangement entirely efficient we must go a little further into the construction of a steam-engine4 ,the pellet in the tube has no connection with the outside1 and we can get nothing from it4 ,so we give it a stem1 thus3 and when we do so we change it into a piston and its rod4 ,where it passes through the stopper at the end of the tube it must pass air- 7or steam-7 tight4 ,then as we push the piston back and forth we have a movement that we can attach to machinery at the end of the rod1 and get a result from4 ,we also move the cocks1 or valves1 automatically by the movement of the rod4 ,illustration3 ,fig4 #c ,turning now to ,fig4 #c again let us imagine a connection made between the rod and the end of the lever in ,fig4 #b4 ,now put on the air 7or steam7 pressure1 and when the piston has reached the right-hand end of the tube it automatically1 by its connections1 closes ,b4 and opens ,a41 and opens ,d4 and closes ,c4 ,the pellet will be pushed back in the tube and go to the other end of it1 through the pressure coming against the piston through the part of the air tube where the cock ,d4 is open4 ,it reaches the left-hand end of the tube1 and we must imagine that when it gets there it1 in the same manner and by the proper connections1 closes ,d41 opens ,c41 closes ,a4 and opens ,b4 ,if these mechanical movements are completed it must be plain that so long as the air 7or steam7 pressure is continued in the forked pipe the piston will automatically cut off its supply and open its escape at each alternate end1 and move back and forth4 ,any boy can see how a backward and forward movement may be made to give motion to a crank4 ,all other details in an engine are questions of convenience in construction1 and not questions of principle or manner of action4 ,of older readers1 ,i might request the supposition that1 in ,fig4 #b1 only the valves ,a4 and ,b4 were automatically and invariably opened and closed by the action of the piston-rod of ,fig4 #c1 and that ,c4 and ,d4 were controlled solely by the governor1 before mentioned1 which we will suppose to be located at ,e4 ,then the escape of the steam ahead of the piston must always come at the same time with reference to the stroke1 but the supply will depend upon the requirements of each individual stroke1 and the work it has to do1 and afford to the piston a greater or less push1 as the emergencies of that particular instant may require4 ,this arrangement would be one of regularity of movement and of economy in the use of steam4 ,that which is needed is supplied1 and no more4 ,this is the principle and the object of the ,corliss cut-off1 and of all others similar to it in purpose4 ,their principle is that only the escape is automatically controlled by the movements of the piston-rod1 occurring always at the same time with reference to the stroke1 while the supply is under control of the movement of the governor1 and regulated according to the emergencies of the movement4 ,the governor1 in any of its forms1 as ordinarily applied1 performs only half of this function4 ,it regulates the general supply of steam to the cylinder1 but the supply-valve continues to be opened1 always to full width1 and always at the same moment with reference to the stroke4 ,with the two separate sets of automatic machinery required by engines of the ,corliss type1 the piston does not always receive its steam at the beginning of the stroke1 and the supply may be cut off partially or entirely at any point in its passage along the cylinder1 as the work to be done requires4 ,the economic value of such an arrangement is manifest4 ,no attempt is made here to explain by means of elaborate diagrams4 ,it is believed that if the reason of things1 and the principle of action1 is clear1 the particulars may be easily studied by any reader who is disposed to master mechanical details4 ,,the ,,age ,,of ,,steel ,in very recent times the processes of civilization have had a strong and almost unnoted tendency toward the increased use of the best4 ,thus1 most that iron once was1 in use and practice1 steel now is4 ,this use1 growing daily1 widens the scope that must be taken in discussing the features of an ,age of ,steel4 ,one name has largely supplanted the other4 ,in effect iron has become steel4 ,had this chapter been written twenty1 or perhaps ten1 years earlier1 it should have been more appropriately entitled the ,age of ,iron4 ,a separation of the two great metals in general description would be merely technical1 and ,i shall treat the subject very much as though1 in accordance with the practical facts of the case1 the two metals constituted one general subject1 one of them gradually supplanting the other in most of the fields of industry where iron only was formerly used4 ,the greatest progresses of the race are almost always unappreciated at the time1 and are certainly undervalued1 except by contrast and comparison4 ,we must continually turn backward to see how far we have gone4 ,an individual who is born into a certain condition thinks it as hard as any other until by experience and comparison he discovers what his times might have been4 ,as for us1 in the year #ahid1 we are not compelled to look backward very far to observe a striking contrast4 ,illustration3 ,,in ,,old ,,times4 ,,prying ,,out ,a ,,bloom4 ,all the wealth of today is built upon the forests and prairies and swamps of yesterday1 and we must take a wider and more comprehensive glance backward if we should wish to institute those comparisons which make contrasts startling4 ,we are accustomed to read and to hear of the ,age of this or that4 ,there was a ,stone ,age1 beginning with the tribes to whom it came before the beginnings of their history1 or even of tradition1 and if we look far backward we may contrast our own time with the times of men who knew no metals4 ,they were men4 ,they lived and hoped and died as we do1 even in what is now our own country4 ,often they were not even barbarians4 ,they builded houses and forts1 and dug drains and built aqueducts1 and tilled the soil4 ,they knew the value of those things we most value now1 home and country2 and they organized armies1 and fought battles1 and died for an idea1 as we do4 ,yet all the time1 a time ages long1 the utmost help they had found for the bare and unaided hand was the serrated edge of a splintered flint1 or the chance-found fragment beside a stream that nature1 in a thousand or a million years of polishing1 had shaped into the rude semblance of a hammer or a pestle4 ,all men have in their time burned and scraped and fashioned all they needed with an astonishing faculty of making it answer their needs4 ,they once almost occupied the world4 ,such were those who1 so far as we know1 were once the exclusive owners of this continent4 ,they were an agricultural1 industrious and home-loving people4 ,footnote3 ,the ,mound ,builders and ,cave ,dwellers4 ,they knew only lead and copper4 ,then came1 with a strange leaving out of the plentiful and easily worked metals which are the subject of this chapter1 the great ,age of ,bronze4 ,this next stage of progress after stone was marked by a skillful alloy1 requiring even now some scientific knowledge in its compounding of copper and tin4 ,a thousand theories have been brought forward to account for this hiatus in the natural stages of human progress1 the truth probably being that both tin and copper are more fusible than iron-ores1 and that both are found as natural metals4 ,some accident such as accounts for the first glass1 ,footnote3 ,the story is told by ,pliny4 ,some sailors1 landing on the eastern coast of ,spain1 supported their cooking utensils on the sand with stones1 and built a fire under them4 ,when they had finished their meal1 glass was found to have been made from the niter and sea-sand by the heat of their fire4 ,the same thing has been done1 by accident1 in more recent times1 and may have been done before the incident recounted4 ,it is also done by the lightning striking into sand and making those peculiar glass tubes known as ,fulmenites1 found in museums and not very uncommon4 some camp-fire unintended fusion1 produced the alloy that became the metal of all the arms and arts1 and so remained for uncounted centuries4 ,in this connection it is declared that the ,age of ,bronze knew something that we cannot discover2 the art of tempering the alloy so that it would bear an edge like fine steel4 ,if this be true and we could do it1 we should by choice supplant the subject of this chapter for a thousand uses4 ,as the matter stands1 and in our ignorance of a supposed ancient secret1 the tempering of bronze has an effect precisely opposite to that which the process has upon steel4 ,nevertheless1 the old ,age of ,bronze had its vicissitudes4 ,those men knew nothing that we consider knowledge now4 ,it was a time when some of the most splendid temples1 palaces and pyramids were constructed1 and these now lie ruined yet indestructible in the nooks and corners of a desert world4 ,perhaps the hard rock was chiselled with tools of tempered copper4 ,the fact is of little importance now since the object of the art is almost unknown1 and the scattered capitals and columns of ,baalbeck are like monuments without inscriptions2 the commemorating memorials of a memory unknown4 ,the ,age of ,bronze and all other ages that have preceded ours lacked the great essentials that insure perpetuity4 ,the ,age of ,steel1 that came last1 that is ours now2 a degenerate time by all ancient standards2 has for its crowning triumph a single machine which is alone enough to satisfy the union of two names that are to us what ,caster and ,pollux were to the bronze-armed ,roman legions of the heroic time--the modern power printing-press4 ,it may be well to ask and answer the question that at the first view may seem to the reader almost absurd4 ,what is steel8 ,the answer must1 in the majority of instances1 be given in accordance with the common conception2 which is that it is not iron1 yet very like it4 ,the old classification of the metal1 even familiarly known1 needs now to be supplemented1 since it does not describe the modern cast and malleable compounds of iron1 carbon and metalloids used for structural purposes1 and constituting at least three-fourths of the metal now made under the name of steel4 ,the old term1 steel1 meant the cast1 but malleable1 product of iron1 containing as much carbon as would cause the metal to harden when heated to redness and quenched in water4 ,it must also be included in the definition that the product must be as free as possible from all admixtures except the requisite amount of carbon4 ,this is tool steel4 ,footnote3 ,it must not be understood that tool steel was always a cast metal4 ,in manufacturing1 iron bars were laid together in a box or retort1 together with powdered charcoal1 and heated to a certain degree for a certain time4 ,the carbon from the charcoal was absorbed by the iron1 and from the blistered appearance of the bars when taken out this product was1 and is known as blister steel4 ,and here occurs a strange thing4 ,a skill in chemistry1 the successor of alchemy1 is the educational product of the highest form of civilization4 ,illustration3 ,,ancient ,,smelting4 ,a ,,rude ,,wall ,,enclosing ,,alternate ,,layers ,,of ,,iron ,,ore ,,and ,,charcoal4 ,metallurgy is the highest and most difficult branch of chemistry4 ,steel is the best result of metallurgy4 ,yet steel is one of the oldest products of the race1 and in lands that have been asleep since written history began4 ,wendell ,phillips in a lecture upon ,the ,lost ,arts1--celebrated at the date of its delivery1 but now obsolete because not touching upon advances made in science since ,phillips's day1--states that the first needle ever made in ,england1 in the time of ,henry ,,viii1 was made by a ,negro1 and that when he died the art died with him4 ,they did not know how to prepare the steel or how to make the needle4 ,he adds that some of the earliest travelers in ,africa found a tribe in the interior who gave them better razors than the explorers had4 ,oriental steel has been celebrated for ages as an inimitable product4 ,it is certainly true that by the simple processes of semi-barbarism the finest tool-steel has been manufactured1 perhaps from the days of ,tubal ,cain downward4 ,the keenness of edge1 the temper whose secret is now unknown1 the marvelous elasticity of the tools of ancient ,damascus1 are familiar by repute to every reader and have been celebrated for thousands of years4 ,the swords and daggers made in central ,asia two thousand years ago were more remarkable than any similar product of the present for elaborate and beautiful finish as well as for a cutting quality and a tenacity of edge unknown to modern days4 ,all the tests and experiments of a modern government arsenal1 with all the technical knowledge of modern times1 do not produce such tool-steel4 ,it is also alleged that the ancient weapons did not rust as ours do1 and that the oldest are bright to this day4 ,the steel tools and arms that are made in the strange country of ,india do not rust there1 while in the same climate ours are eaten away4 ,besides the secret of tempering bronze1 it would seem that among the lost arts ,footnote3 ,modern science dates from three discoveries4 ,that of ,copernicus1 the effect of which was to separate scientific astronomy1 the astronomy of natural law and defined cause1 from astrology1 or the astronomy of assertion and tradition4 ,that of ,torricelli and ,paschal of the actual and measurable weight of the atmosphere1 which was the beginning for us of the science of physics1 and that of ,lavoisier who suspected1 and ,priestly who demonstrated1 oxygen and destroyed the last vestiges of the theory of alchemy4 ,stahl was the last of these1 and ,lavoisier the first of the new school in that which ,i have stated is the highest development of modern science1 chemistry4 ,in all these departments we have no adequate reason to assert that we are not ourselves mere students4 ,some of the functions of oxygen1 and the simplest1 were unknown within five years before the date of these chapters4--a subject that it is easy to make too much of--there was a chemical ingredient or proportion in steel that we now know nothing of4 ,the old lands of sameness and slumber have kept their secrets4 ,the definition of the word steel has been the subject of a scientific quarrel on account of new processes4 ,the grand distinguishing trait of steel1 to which it owes all the qualities that make it valuable for the uses to which no other metal can be put1 is homogeneity due to fusion4 ,wrought iron1 while having similar chemical qualities1 and often as much carbon1 is laminated in structure4 ,structural qualities are largely increasing in importance1 and as the structural compounds came gradually to be produced more and more by the casting processes2 as they ceased to be laminated in structure and became homogeneous1 they were called by the name of steel4 ,the name has been based upon the structure of the material rather than upon its chemical ingredients as heretofore4 ,there is now a disposition to call all compounds of iron that are crystalline in structure1 made homogeneous by casting1 by the general name of steel1 and to distinguish all those whose structural quality is due to welding by the name of iron4 ,footnote3 ,it should be understood that the shapes of structural and other forms of what we now call steel are given by rolling the ingot after casting1 and that the crystalline composition of the metal remains4 ,this is an outline of the controversy about the differences which should be expressed by a name1 between tool steel and structural steel4 ,in tool steel there is an almost infinite variety as to quality4 ,the best is a high product of practical science1 and how to make the best seems now1 as hinted above1 a lost art4 ,it has1 besides1 a great variety4 ,these varieties are only produced after thousands of experiments directed to finding out what ingredients and processes make toward the desired result4 ,these processes1 were they all known outside the manufactories of certain specialists1 would little interest the general reader4 ,all machinists know of certain brands of tool steel which they prefer4 ,tool steel is made especially for certain purposes2 as for razors and surgical instruments1 for saws1 for files1 for springs1 for cutting tools generally4 ,in these there may be little actual difference of quality or manufacture4 ,the tempering of steel after it has been forged into shape is a specialty1 almost a natural gift4 ,the manufacture of tool steel1 is1 as stated1 one of the most technical of the arts1 and one of the most complicated of the applications of long experience and experiment4 ,cast steel was first made in #aggj by ,huntsman1 who for the first time melted the blistered steel1 which until that time had been the tool steel of commerce1 in a crucible4 ,since that time the process of melting wrought iron has become practical and cheap1 and results in crystalline1 instead of a laminated structure for all steels4 ,the definition of steel now is that it is a compound of iron which has been cast from a fluid state into a malleable mass4 ,the ordinary test applied to distinguish wrought iron from steel is to ascertain whether the metal hardens with heating and suddenly cooling in cold water1 becoming again softened on reheating and cooling slowly4 ,if it does this it is steel of some quality1 good or bad2 if not1 it is iron4 99 99 99 99 99 ,the first mention of iron-ore in ,america is by ,thomas ,harriot1 an ,english writer of the time of ,raleigh's first colonies4 ,he wrote a history of the settlement on ,roanoke ,island1 in which he says3 ,in two places in the countrey specially1 one about foure score and the other six score miles from the port or place where wee dwelt1 wee founde neere the water side the ground to be rockie1 which by the triall of a minerall man1 was found to hold iron richly4 ,it is founde in manie places in the countrey else4 ,harriot speaks further of the small charge for the labour and feeding of men2 the infinite store of wood2 the want of wood and the deerness thereof in ,england4 ,it was before the day of coal and coke1 or of any of the processes known now4 ,the iron mines of ,roanoke ,island were never heard of again4 ,iron-ore in the colonies is again heard of in the history of ,jamestown1 in #afjg4 ,a ship sailed from there in #afjh freighted with iron-ore1 sassafras1 cedar posts and walnut boards4 ,seventeen tons of iron were made from this ore1 and sold for four pounds per ton4 ,this was the first iron ever made from ,american ores4 ,the first iron-works ever erected in this country were1 of course almost1 burned by the ,indians1 in #afbb1 and in connection three hundred persons were killed4 ,illustration3 ,,early ,,smelting ,,in ,,america4 ,fire and blood was the end of the beginning of many ,american industries4 ,ore was plentiful1 wood was superabundant1 methods were crude4 ,they could easily excel the ,virginia colonists in making iron in ,persia and ,india at the same date4 ,the orientals had certain processes1 descended to them from remote times1 discovered and practiced by the first metal-workers that ever lived4 ,the difference in the situation now is that here the situation and methods have so changed that the story is almost incredible4 ,there1 they remain as always4 ,the first instance of iron-smelting in ,america is a text from which might be taken the entire vast sermon of modern industrial civilization4 ,the orientals lacked the steam-engine4 ,so did we in ,america4 ,the blast was impossible everywhere except by hand1 and contrivances for this purpose are of very great antiquity4 ,the bellows was used in ,egypt three thousand years ago4 ,it may be that the very first thought by primitive man was of how to smelt the metals he wanted so much and needed so badly4 ,his efforts to procure a means of making his fire burn under his little dump of ore led him first into the science which has attained a new importance in very recent times1 pneumatics4 ,the first ,american furnaces were blown by the ordinary leather bellows1 or by a contrivance they had which was called a blowing tub1 or by a very ancient machine known as a trompe in which water running through a wooden pipe was very ingeniously made to furnish air to a furnace4 ,it is when the means are small that ingenuity is actually shown4 ,if the later man is deprived of the use of the latest machinery he will decline to undertake an enterprise where it is required4 ,the same man in the woods1 with absolute necessity for his companion1 will show an astonishing capacity for persevering invention1 and will live1 and succeed4 ,illustration3 ,,water-,,power ,,blowing ,,tub4 ,in the lack of steam they learned1 as stated1 to use water-power for making the blast4 ,the blowing-tub was such a contrivance4 ,it was built of wood1 and the air-boxes were square4 ,there were two of these1 with square pistons and a walking-beam between them4 ,a third box held the air under a weighted piston and fed it to the furnace4 ,some of these were still in effective use as late as #ahgc4 ,they were still used long after steam came4 ,the entire machine might be called1 correctly1 a very large piston-bellows4 ,a smaller machine with a single barrel may be found now1 reduced1 in the hands of men who clean the interior of pianos1 and tune them4 ,the first iron works built in the present ,united ,states that were commercially successful1 were established in ,massachusetts1 in the town of ,saugus1 a few miles from ,boston4 ,the company had a monopoly of manufacture under grant for ten years4 ,footnote3 ,some quaint records exist of the incidents of manufacturing in those times4 ,in #agbh1 ,samuel ,higley and ,joseph ,dewey1 of ,connecticut1 represented to the ,legislature that ,higley had1 with great pains and cost1 found out and obtained a curious art by which to convert1 change1 or transmute1 common iron into good steel sufficient for any use1 and was the first that ever performed such an operation in ,america4 ,a certificate1 signed by ,timothy ,phelps and ,john ,drake1 blacksmiths1 states that1 in ,june1 #agbe1 ,mr4 ,higley obtained from the subscribers several pieces of iron1 so shaped that they could be known again1 and that a few days later he brought the same pieces which we let him have1 and we proved them and found them good steel1 which was the first steel that ever was made in this country1 that we ever saw or heard of4 ,but this remarkable transmuting process was not heard of again unless it be the process of case-hardening1 re-invented some years ago1 and known now to mechanics as a recipe4 ,the smallness of things may be inferred from the fact that1 in #agdj1 the ,connecticut ,legislature granted to ,messrs4 ,fitch1 ,walker ,wyllys the sole privilege of making steel for the term of fifteen years1 upon this condition that they should1 in the space of two years1 make half a ton of steel4 ,even this condition was not complied with and the term was extended4 ,they began in #afdc1 twenty-three years after the landing1 which is one of the evidences of the anxiety of those troublesome people to be independent1 and of how well men knew1 even in those early times1 how much the production of iron at home has to do with that independence4 ,this new industry was1 at all times1 controlled and regulated by law4 ,the very first hollow-ware casting made in ,america is said to be still in existence4 ,it was a little kettle holding less than a quart4 ,illustration3 ,,the ,,first ,,casting ,,made ,,in ,,america4 ,the beginnings of the iron industry in ,america were none too early4 ,there came a need for them very soon after they had extended into other parts of ,new ,england1 and into ,new ,jersey1 ,new ,york1 ,pennsylvania and ,maryland4 ,in #agge1 there were a large number of small furnaces and foundries4 ,but coal and iron1 the two earth-born servants of national progress which are now always twins1 were not then coupled4 ,the first of them was out of consideration4 ,the early iron men looked for water-falls instead1 and for the wood of the primeval forest4 ,footnote3 ,it is now easy to learn that a coal-mine may be a more valuable possession than a gold-mine1 and that iron is better as an industry than silver4 ,there are mountains of iron in ,mexico1 but no coal1 and silver-mines so rich that silver1 smelted with expensive wood fuel1 is the staple product of the country4 ,yet the people are among the poorest in ,christendom4 ,there is a ceaseless iron-famine1 so that the chiefest form of railway robbery is the stealing of the links and pins from trains4 ,there are almost no metal industries4 ,a barbaric agriculture prevails for the want of material for the making of tools4 ,the actual means of progress are not at hand1 notwithstanding the product of silver1 which goes by weight as a commodity to purchase most that the country needs4 ,they became very necessary to the country in #agee--when the ,french war came1 and they then began the making of the shot and guns used in that struggle1 and became accustomed to the manufacture in time for the ,revolution4 ,looking back for causes conducive to momentous results1 we may here find one not usually considered in the histories4 ,but for the advancement of the iron industry in ,america1 great for the time and circumstances1 independence could not have been won1 and even the feeling and desire of independence would have been indefinitely delayed4 ,the industry was slow1 painful1 and uncertain1 only because the mechanic arts were pursued only to an extent possible with the skill and muscular energy of men4 ,there were none of the wonderful automatic mechanisms that we know as machine-tools4 ,there was only the almost unaided human arm with which to subdue the boundless savagery of a continent1 and win independence and form a nation besides4 ,the demand for huge masses of the most essential of the factors of civilization has grown since1 because the ironclad and the big gun have come1 and those inadequate forces and crude methods supplied for a time the demand that was small and imperative4 ,the largest mass made then1 and frequently spoken of in colonial records1 was a piece called a sow2 spelled then sowe4 ,it was a long1 triangular mass1 cast by being run into a trench made in sand4 ,footnote3 ,when1 later1 little side-trenches were made beside the first1 with little channels to carry the metal into them1 the smaller castings were naturally called pigges4 ,hence our pig-iron4 ,illustration3 ,,making ,a ,,trench ,,to ,,cast ,a ,,sowe4 ,those were the palmy days of the trip hammer4 ,nasmyth was not born until #ahjh1 and no machine inventor had yet come upon the scene4 ,the steam-hammer that bears his name1 which means a ponderous and powerful machine in which the hammer is lifted by the direct action of steam in a piston1 the lower end of whose rod is the hammer-head1 has done more for the development of the iron industry than any other mechanical invention4 ,it was not actually used until #ahdb1 or '#dc4 ,it finally1 with many improvements in detail1 grew into a monster1 the hammer-head1 or tup1 being a mass of many tons4 ,and they of modern times were not content merely to let this great mass fall4 ,they let in steam above the piston1 and jammed it down upon the mass of glowing metal1 with a shock that jars the earth4 ,the strange thing about this ,titanic machine is that it can crack an egg1 or flatten out a ton or more of glowing iron4 ,hundreds of the forgings of later times1 such as the wrought iron or steel frames of locomotives1 and the shafts of steamers1 and the forged modern guns1 could not be made by forging without this steam hammer4 ,illustration3 ,,the ,,steam ,,hammer4 ,then slowly came the period of all kinds of machine tools4 ,during the period briefly described above they could not make sheet metal4 ,the rolling mill must have come1 not only before the modern steam-boiler1 but even before the modern plow could be made4 ,can the reader imagine a time in the ,united ,states when sheet metal could not be rolled1 and even tin plates were not known8 ,if so1 he can instantly transport himself to the times of the wooden trencher1 and the pewter mug and pitcher1 to the days when iron rails for tramways were unknown1 and when even the strap-iron1 always necessary1 was rudely and slowly hammered out on an anvil4 ,footnote3 ,about #agbj1 nails were the most needed of all the articles of a new country4 ,farmers made them for themselves1 at home4 ,the secret of how to roll out a sheet and split it into nail-rods was stolen from the one shop that knew how1 at ,milton1 ,mass41 to give to another at ,mlddleboro4 ,the thief had the ,biblical name of ,hashay ,h4 ,thomas4 ,he stole the secret while the hands of the ,milton mill were gone to dinner1 and served his country and broke up a small monopoly in so doing4 ,shears came with the rolls2 vast engines of gigantic biting capacity1 that cut sheets of iron as a lady's scissors cut paper4 ,this cut the squares of metal used for boiler plates1 and the steam-engine having come1 was turned to the manufacture of materials for its own construction4 ,others were able to bite off great bars4 ,the first mill in which iron was rolled in ,america1 was built in #ahag near ,connellsville1 in ,fayette county1 ,penn4 ,until #ahdd1 the rolling mills of this country produced little more than bar-iron1 hoops1 and plates4 ,all the early attempts at railroads used the strap rail2 unless cast fish-bellies were used2 which was flat bar-iron provided with counter sunk holes1 in which to drive nails for holding the iron to long stringers of wood laid upon ties4 ,when actual rail-making for railroads began1 the rolling mill raised its powers to meet the emergency4 ,the ,t rail1 universally now used1 was invented by ,robert ,stevens1 president and chief engineer of the ,camden and ,amboy railroad1 and the first of them were laid as track for that road in #ahcb4 ,from this time until #ahej1 rolling mills for making ,u and ,t rails rapidly increased in number1 but in that year all but two had ceased to be operated because of foreign competition4 ,illustration3 ,,shears ,,for ,,cutting ,,bar-,,iron4 ,during some five years previous to this writing a revolution has taken place in the construction of buildings which has resulted in what is known as the sky-scraper4 ,this was1 in many respects1 the most startling innovation of times that are startling in most other respects1 and was begun in that metropolis of surprises and successes1 the city of ,chicago4 ,this innovation was really such in the matter of using steel in the entire framing of a commercial building1 but it was not the first use of metal as a building material4 ,the first iron beams used in buildings were made in #ahed1 in a rolling mill at ,trenton1 ,n4 ,j41 and were used in the construction of the ,cooper ,institute1 and the building of ,harper ,brothers4 ,for these special rolls1 of a special invention1 were made4 ,these have now become obsolete1 and a new arrangement is used for what are known as structural shapes4 ,illustration3 ,,hydraulic ,,shears4 ,,the ,,knife ,,has ,a ,,pressure ,,of #c1jjj ,,tons1 ,,clipping ,,pieces ,,of ,,iron ,,two ,,by ,,four ,,feet4 ,i have spoken of the use of wood-fuel in the early stages of iron manufacture in this country1 followed by the adoption exclusively of coal and its products4 ,then1 many years later1 came the departure from this in the use of gas for fuel4 ,the first use of this kind is said to date as far back as the eighth century1 and modifications of the idea had been put in practice in this country1 in which gas was first made from coal and then used as fuel4 ,then came natural gas4 ,this product has been known for many centuries4 ,it was the eternal fuel of the ,persian fire-worshippers1 and has been used as fuel in ,china for ages4 ,its earliest use in this country was in #ahbg1 when it was made to light the village of ,fredonia1 ,n4 ,y4 ,probably its first use for manufacturing purposes was by a man named ,tompkins1 who used it to heat salt-kettles in the ,kenawha valley in #ahdb4 ,its next use for manufacturing purposes was made in a rolling mill in ,armstrong county1 ,penn41 in #ahgd1 forty-seven years after it had been used at ,fredonia1 and twenty-nine years after it had been used to boil salt4 ,now the use of natural gas as manufacturing fuel is universal1 not alone over the spot where the gas is found1 but in localities hundreds of miles away4 ,it is one of the strangest developments of modern scientific ingenuity4 ,that enormous battery of boilers1 which was one of the most imposing spectacles of the ,columbian ,exhibition of #ahic1 whose roar was like that of ,niagara1 was fed by invisible fuel that came silently in pipes from a state outside of that where the great fair was held4 ,we are left to the conclusion that the making of the coal into gas at the mine1 and the shipping of it to the place of consumption through pipes1 is more certain of realization than were a hundred of the early problems of ,american progress that have now been successful for so long that the date of their beginning is almost forgotten4 ,,the ,,steel ,,of ,,the ,,present4--,the story of steel has now almost been told1 in that general outline which is all that is possible without an extensive detail not interesting to the general reader4 ,in it is included1 of necessity1 a resum of the progress1 from the earliest times in this country1 of the great industry which is more indicative than any other of the material growth of a nation4 ,i now come to that time when steel began to take the place that iron had always held in structural work of every class4 ,the differences between this structural steel and that which men have known by the name exclusively from remote ages1 ,i have so far indicated only by reference to the well-known qualities of the latter4 ,it now remains to describe the first4 ,in #ahdf an ,american named ,william ,kelley was the owner of an iron-works at ,eddyville1 ,ky4 ,it was an early era in ,american manufactures of all kinds1 and the district was isolated1 the town not having five hundred inhabitants1 and the best mechanical appliances were remote4 ,in #ahdg1 ,kelley began1 without suggestion or knowledge of any experiments going on elsewhere1 to experiment in the processes now known as the ,bessemer1 for the converting of iron into steel4 ,to him occurred1 as it now appears first1 the idea that in the refining process fuel would be unnecessary after the iron was melted if powerful blasts of air were forced into the fluid metal4 ,this is the basic principle of the ,bessemer process4 ,the theory was that the heat generated by the union of the oxygen of the air with the carbon of the metal1 would accomplish the refining4 ,kelley was trying to produce malleable iron in a new1 rapid and effective way4 ,it was merely an economy in manufacture he was endeavoring to attain4 ,to this end he made a furnace into which passed an air-blast pipe1 through which a stream of air was forced into the mass of melted metal4 ,he produced refined iron4 ,following this he made what is now called a converter1 in which he could refine fifteen hundred pounds of metal in five minutes1 effecting a great saving in time and fuel1 and in his little establishment the old processes were thenceforth dispensed with4 ,it was locally known as ,kelley's air-boiling process4 ,it proved finally to be the most important1 in large results1 ever conceived in metallurgy4 ,i refer to it hurriedly1 and do not attempt to follow the inventor's own description of his constructions and experiments4 ,when he heard that others in ,england were following the same line of experiment1 he applied for a patent4 ,he was decided to be the first inventor of the process1 and a patent was granted him over ,bessemer1 who was a few days before him4 ,there is no question that others were more skillful1 and with better opportunities and scientific associations1 in carrying out the final details1 mechanical and chemical1 which have completed the ,kelley process for present commercial uses4 ,neither is there any question that this back-woods iron-making ,american was the first to refine iron by passing through it1 while fluid1 a stream of air1 which is the process of making that steel which is not tool steel1 and yet is steel1 the now almost universal material for the making of structures2 the material of the ,ferris wheel1 the wonderful palaces of the ,columbian exposition1 the sky-scrapers of ,chicago1 the rails1 the tacks1 ,footnote3 ,in the history of ,rhode ,island1 by ,arnold1 it is claimed that the first cold cut nails in the world were made by ,jeremiah ,wilkinson1 in #aggg4 ,the process was to cut them from an old chest-lock with a pair of shears1 and head them in a smith's vise4 ,then small nails were cut from old ,spanish hoops1 and headed in a vise by hand4 ,needles and pins were made by the same person from wire drawn by himself4 ,supposing this to be the beginning of the cut-nail idea1 the machine for making them would still remain the actual and practical invention1 since it would mark the beginning of the industry as such4 ,the importance of the latter event may be measured by the fact that about the end of the last century there began a strong demand4 ,in the homely farm-houses1 or the little contracted shops of ,new ,england villages1 the descendants of the ,pilgrims toiled providently1 through the long winter months1 at beating into shape the little nails which play so useful a part in modern industry4 ,a small anvil served to beat the wire or strip of iron into shape and point it2 a vise worked by the foot clutched it between jaws furnished with a gauge to regulate the length1 leaving a certain portion projecting1 which1 when beaten flat by a hammer1 formed the head4 ,this was industry1 but not manufacture1 for in #ahij the manufacturers of this country produced over eight hundred million pounds of iron1 steel1 and wire nails1 representing a consumption of this absolutely indispensable manufacture for that year1 at the rate of over twelve pounds for each individual inhabitant of the ,united ,states4 the fence-wire1 the sheet-metal1 the rails of the steam-railroads and the street-lines1 the thousand things that cannot be thought of without a list1 and which is a material that is furnished more cheaply than the old iron articles were for the same purposes4 ,illustration3 ,,sectional ,,view ,,of ,a ,,bessemer ,,converter4 ,the technical detail of steel-making is exceedingly interesting to students of applied science1 but it is detail1 the key to which is in the process mentioned2 the forcing of a stream of air through a molten mass of iron4 ,the converter is a huge pitcher-shaped vessel1 hung upon trunnions so as to be tilted1 and it is usual to admit through these trunnions1 by means of a continuing pipe1 the stream of air4 ,the converters may contain ten tons or more of liquid metal at one time1 which mass is converted from iron into steel at one operation4 ,forty-five years ago1 or less1 works that could turn out fifty tons of iron in a day were very large4 ,now there are many that make five hundred tons of steel in the same time4 ,then1 nearly all the work was done by hand1 and men in large numbers handled the details of all processes4 ,now it would be impossible for human hands and strength to do the work4 ,the steel-mill is1 indeed1 the most colossal combination of ,steam and ,steel4 ,there are tireless arms1 moved by steam1 insensible alike to monstrous strains and white heat1 which seize the vast ingots and carry them to and fro1 handling with incredible celerity the masses that were unknown to man before the invention of the ,bessemer process4 ,and all these operations are directed and controlled by a man who stands in one place1 strangely yet not inappropriately named a pulpit1 by means of the hand-gear that gives them all to him like toys4 ,no one who has seen a steel-mill in operation1 can go away and really write a description of it2 no artist or camera has ever made its portrait1 yet it is the most impressive scene of the modern1 the industrial1 world4 ,there is a fervent heat1 surpassing in its impressions all the descriptions of the ,bible1 and which destroys all doubt of fire with capacity to burn a world and roll the heavens together as a scroll4 ,there is a clang and clatter accompanying a marvelous order4 ,there are clouds of steam4 ,there are displays of sparks and glow surpassing all the pyrotechnics of art4 ,monstrous throats gasp for a draught of white-hot metal and take it at a gulp4 ,glowing masses are trundled to and fro4 ,there are mountains of ore1 disappearing in a night1 and ever renewed4 ,there is a railway system1 and the huge masses are conveyed from place to place by locomotive engines4 ,there is a water system that would supply a town4 ,there may be miles of underground pipes bringing gas for fuel4 ,amid these scenes flit strong men1 naked to the waist1 unharmed in the red pandemonium1 guiding every process1 superintending every result2 like other men1 yet leading a life so strange that it is apparently impossible4 ,the glowing rivers they escape2 corruscating showers of flying white-hot metal do not fall upon them2 the leaping1 roaring1 hungry1 annihilating flames do not touch them2 the gurgling streams of melted steel are their familiar playthings2 yet they are but men4 ,the rolling of these slabs and ingots into rails is a following operation still4 ,the continuous rail is often more than a hundred feet in length1 which is cut into three or four rails of thirty feet each1 and it goes through every operation that makes it a ,t rail weighing ninety pounds to the yard with the single first heat4 ,there are trains of rolls that will take in a piece of white-hot metal weighing six tons1 and send it out in a long sheet three thirty-seconds of an inch thick and nearly ten feet wide4 ,the first steel rails made in this country were made by the ,chicago ,rolling ,mill ,company1 in ,may1 #ahfe4 ,only six rails were then made1 and these were laid in the tracks of the ,chicago and ,north ,western ,railroad4 ,it is said they lasted over ten years4 ,the first nails1 or tacks1 were made of steel at ,bridgewater1 ,mass41 at about the same date4 ,illustration3 ,,rolling ,,ingots4 ,some thirty years ago there were but two ,bessemer converters in the ,united ,states1 and the manufacture of steel did not reach then five hundred tons per annum4 ,in #ahij the product was more than five million tons4 ,in #ahgb the price of steel was one hundred and eighty-six dollars per gross ton4 ,it can be purchased now at varying prices less than thirty dollars per ton4 ,the consumption of seventy millions of people is so great that it is difficult to imagine how so enormous a mass of almost imperishable material can be absorbed1 and the latest figures show a consumption greatly in excess of those mentioned as the sum of manufactures4 ,we turn again for the comparison without which all figures are valueless to the good year #afdc1 when the ,general court passed a resolve commending the great progress made in the manufacture of iron which they had licensed two years before1 and granted the company still further privileges and immunities upon condition that it should furnish the people with barre iron of all sorts for their use at not exceedynge twenty pounds per ton4 ,we recall the first little piece of hollow ware made in ,america4 ,we remember how old the old world is said to be and how long the tribes of men have plodded upon it1 and then the picture appears of the progress that has grown almost under our eyes4 ,the real ,age of ,steel began in #ahfe4 ,it is not yet thirty years old4 ,by comparison we are impressed with the fact that the real history of the metal is compressed into less than half an ordinary lifetime4 ,,the ,,story ,,of ,,electricity ,illustration3 ,,eripuit ,,caelo ,,fulmen1 ,,sceptrumque ,,tyrannis4 ,there is a sense in which electricity may be said to be the youngest of the sciences4 ,its modern development has been startling4 ,its phenomena appear on every hand4 ,it is almost literally true that the lighting has become the servant of man4 ,but it is also the oldest among modern sciences4 ,its manifestations have been studied for centuries4 ,so old is its story that it has some of the interest of a mediaeval romance2 a romance that is true4 ,steam is gross1 material1 understandable1 noisy4 ,its action is entirely comprehensible4 ,the explosives1 gunpowder1 begriming the nations in all the wars since #acej1 nitroglycerine1 oxygen and hydrogen in all the forms of their combination1 seem to be gross and material1 the natural1 though ferocious1 servants of mankind4 ,but electricity floats ethereal1 apart1 a subtle essence1 shining in the changing splendors of the aurora yet existent in the very paper upon which one writes2 mysteriously everywhere2 silent1 unseen1 odorless1 untouchable1 a power capable of exemplifying the highest majesty of universal nature1 or of lighting the faint glow of the fragile insect that flies in the twilight of a summer night4 ,obedient as it has now been made by the ingenuity of modern man1 docile as it may seem1 obeying known laws that were discovered1 not made1 it yet remains shadowy1 mysterious1 impalpable1 intangible1 dangerous4 ,it is its own avenger of the daring ingenuity that has controlled it4 ,touch it1 and you die4 ,electricity was as existent when the splendid scenes described in ,genesis were enacted before the poet's eye as it is now1 and was entirely the same4 ,its very name is old4 ,before there were men there were trees4 ,some of these exuded gum1 as trees do now1 and this gum found a final resting place in the sea1 either by being carried thither by the currents of the streams beside which those trees grew1 or by the land on which they stood being submerged in some of the ancient changes and convulsions to which the world has been frequently subject4 ,in the lapse of ages this gum1 being indestructible in water1 became a fossil beneath the waves1 and being in later times cast up by storms on the shores of the ,baltic and other seas1 was found and gathered by men1 and being beautiful1 finally came to be cut into various forms and used as jewelry4 ,one has but to examine his pipe-stem1 or a string of yellow beads1 to know it even now4 ,it is amber4 ,the ancient ,greeks knew and used it as we do1 and without any reference to what we now call electricity their name for it was ,,elektron4 ,the earliest mention of it is by ,homer1 a poet whose personality is so hidden in the mists of far antiquity that his actual existence as a single person has been doubted1 and he mentions it in connection with a necklace made of it4 ,but very early in human history1 at least six hundred years before ,christ1 this elektron had been found to possess a peculiar property that was imagined to belong to it alone4 ,it mysteriously attracted light bodies to it after it had been rubbed4 ,thales1 the ,franklin of his remote time1 was the man who is said to have discovered this peculiar and mysterious quality of the yellow gum1 and if it be true1 to him must be conceded the unwitting discovery of electricity4 ,it was the first step in a science that usurps all the prerogatives of the ancient gods4 ,he recorded his discovery1 and was impressed with awe by it1 and accounted for the phenomenon he had observed by ascribing to the dull fossil a living soul4 ,that is the unconscious impression still1 after twenty-five hundred years have passed since ,thales died2 that hidden in the heart of electrical phenomena there is a weird sentience2 what a ,greek would consider something divine and immortal apart from matter4 ,but neither ,thales1 nor ,theophrastus1 nor ,pliny the elder1 nor any ancient1 could conceive of a fact but dimly guessed until the day of ,franklin2 that this secret of the silent amber was also that of the thunder-cloud1 that the essence that drew to it a floating filament is also that which rends an oak1 that had splintered their temples and statues1 and had not spared even the image of ,jupiter ,tonans himself4 ,the spectral lights which hung upon the masts of the ancient galleys of the ,mediterranean were named ,castor and ,pollux1 not electricity4 ,absolutely no discovery was made1 though the religion of ancient ,etruria was chiefly the worship of a spirit by them seen1 but unknown2 to us electrical science2 a science chained1 yet really unknown and still feared though chained4 ,it is the story of this servitude only that is capable of being told1 and the first weak bands were a hundred and forty-six years in forging2 from the ,englishman ,gilbert's ,de ,magnete1 to ,franklin's ,kite4 ,during all this time1 and to a great degree long after1 electricity was a scientific toy4 ,experiences in the sparkling of the fur of cats1 the knowledge that there were fishes that possessed a mysterious paralyzing power1 and various common phenomena all attributable to some unknown common cause1 did not greatly increase the sum of actual knowledge of the subject4 ,there was no divination of what the future would bring1 and not the least conception of actual and impending possibilities4 ,when1 finally1 the greatest thinkers of their times began to investigate2 when ,boyle began to experiment1 and even the transcendent genius of ,newton stooped to enquiry2 from the days of those giants down to those of the ,american provincial postmaster1 ,benjamin ,franklin1 a period of some seventy years1 almost all the knowledge obtained was only useful in indicating how to experiment still further4 ,so small was the knowledge1 so aimless the long experimenting1 that the discovery that not amber only1 but other substances as well1 possessed the electric quality when rubbed1 was a notable advance in knowledge4 ,later1 in #agib1 it was found by ,gray that certain substances possessed the power of carrying2 conducting as we now term it2 the mysterious fluid from one substance to another2 from place to place4 ,this discovery constituted an actual epoch in the history of the science1 and justly1 since this small beginning with a wet string and a cylinder of glass or a globe of sulphur was the first unwitting illustration of the net-work of wires now hanging all over the world4 ,the next step was to find that all substances were not alike in a power to conduct a current2 i4e41 that there were conductors and non-conductors1 and all varying grades and powers between4 ,the next discovery was that there were1 as was then imagined1 several kinds of electricity4 ,this conclusion was incorrect1 and its use was to lead at last to the discovery1 by ,franklin1 that the many kinds were but two1 and even these not kinds1 but qualities1 present always in the unchanging essence that is everywhere1 and which are known to us now by the names that ,franklin gave them2 the positive and negative currents2 one always present with the other1 and in every phenomenon known to electrical science4 ,probably the first machine ever contrived for producing an electric current was made by a monk1 a ,scotch ,benedictine named ,gordon who lived at ,erfurt1 in ,saxony4 ,i shall have occasion1 hereafter1 to describe other machines for the same purpose1 and this first contrivance is of interest by comparison4 ,it was a cylinder of glass about eight inches long1 with a wooden shaft in the center1 the ends of which were passed through holes in side-pieces1 and it is said to have been operated by winding a string around the shaft and drawing the ends of the string back and forth alternately4 ,illustration3 ,,the ,,first ,,electrical ,,machine4 ,the ,franklinic machine1 the modern glass disc fitted with combs1 rubbers1 bands and cranks1 is nothing more in principle or manner of action than the first crude arrangement of the monk of ,erfurt4 ,all these experiments1 and all that for many years followed1 were made in electricity produced by friction2 by rubbing some body like glass1 sulphur or rosin4 ,many men took part in producing effects that were almost meaningless to them--the preliminaries to final results for us4 ,improved electrical machines were made1 all seeming childish and inadequate now1 and all wonderful in their day4 ,there is a long list of immortal names connected with the slow development of the science1 and among their experiments the seventeenth century passed away4 ,dufaye and the ,abbe ,nollet worked together about #agcj1 and mutually surprised each other daily4 ,guericke1 better known as the inventor of the air-pump1 made a sulphur-ball machine1 often claimed to have been the first4 ,hawkesbee constructed a glass machine that was an improvement over that of ,guericke4 ,stephen ,gray unfolded the leading principles of the science1 but without any understanding of their results as we now understand them4 ,the next advance was made in finding a way to hold some of the electricity when gathered1 and the toy which we know as the ,leyden ,jar surprised the scientific world4 ,its inventor1 ,professor ,muschenbrock1 wrote an account of it to ,raumur1 and lacks language to express the terror into which his own experiments had thrown him4 ,he had unwittingly accumulated1 and had accidentally discharged1 and had1 for the first time in human experience1 felt something of the shock the modern lineman dreads because it means death4 ,he had toiled until he held the baleful genie in a glass vessel partially filled with water1 and the sprite could not be seen4 ,accidentally he made a connection between the two surfaces of the jar1 and declared that he did not recover from the experience for two days1 and that nothing could induce him to repeat it4 ,he had been touched by the lightning1 and had not known it4 ,footnote3 ,the ,leyden ,jar has little place in the usefulness of modern electricity1 and has no relationship with the modern so-called ,storage ,battery4 ,then began the fakerism which attached itself to the science of electricity1 and that has only measurably abandoned it in very late times4 ,itinerant electricians began to infest the cities of ,europe1 claiming medicinal and almost supernatural virtues for the mysterious shock of the ,leyden ,vial1 and showing to gaping multitudes the quick and flashing blue spark which was1 though no man knew it then1 a miniature imitation of the bolt of heaven4 ,that fact1 verging as closely upon the sublimest power of nature as a man may venture to and live1 was not even suspected until ,franklin had invented a battery of such jars1 and had performed hundreds of experiments therewith that finally established in his acute1 though prosaic1 mind the identity of his puny spark with that terrific flash that1 until that time1 had been regarded by all mankind as a direct and intentional expression of the power of ,almighty ,god4 ,thus ,franklin came into the field4 ,he was an investigator who brought to his aid a singular capacity possessed by the very few2 the capacity for an unbiased looking for the hidden reasons of things4 ,there was no field too sacred or too old for his prying investigations and his private conclusions4 ,he was1 as much as any man ever is1 an original thinker4 ,he knew of all the electrical experiments of others1 and they produced in his mind conclusions distinctly his own4 ,he was1 upon topics pertaining to the field of reason1 experience and common sense1 the clearest and most vigorous writer of his time save one1 and such conclusions as he arrived at he knew how to promulgate and explain4 ,all that ,franklin discovered would but add to the tedium of the subject of electricity now1 but from his time definitely dates the knowledge that of electricity1 in all its developments1 there is really but one kind1 though for convenience sake we may commonly speak of two1 or even more4 ,he first gave the names by which they are still known to the two qualities of one current2 a name of convenience only4 ,he knew first a fact that still puzzles inquiry1 and is still largely unknown--that electricity is not created1 produced1 manufactured1 by any human means1 and that all we may do1 then or now1 is to gather it from its measureless diffusion in the air1 the world1 or the spaces of the wide creation1 and that1 like heat and cold1 it is a relative term4 ,he demonstrated that any body which has electricity gives it to any other body that has at the moment less4 ,before he had actually tried that celebrated experiment which is alone sufficient to give him place among the immortals1 he had declared the theory upon which he made it to be true1 and by reasoning1 in an age that but dimly understood the force and conditions of inductive reason1 had proved that lightning is but an electric spark4 ,it seems hardly necessary to add that his theories were ridiculed by the most intelligent scientists of his time1 and scoffed at even by the countrymen of ,newton and ,davy1 the members of the ,royal ,society of ,england4 ,franklin was a provincial ,american1 and had1 in other fields than electricity1 troubled the ,british placidity4 ,illustration3 ,b4 ,,franklin ,only one of these1 a man named ,collinson1 saw any value in these researches of the provincial in the wilds of ,america4 ,he published ,franklin's letters to him4 ,buffon read them1 and persuaded a friend to translate them into ,french4 ,they were translated afterwards into many languages1 and when in his isolation he did not even know it1 the obscure printer1 the country postmaster who kept his official accounts with his own hands1 was the bearer of a famous name4 ,he was assailed by the ,nollet previously mentioned1 and by a party of ,french philosophers1 yet there arose1 in his absence and without his knowledge1 a party who called themselves distinctively ,franklinists4 ,then came the personal test of the truth of these theories that had been promulgated over ,europe in the name of the unknown ,american4 ,he was then forty-five years old1 successful in his walk and well-known in his immediate locality1 but by no means as prominent or famous among his neighbors as he was in ,europe4 ,he was not so fertile in resources as to be in any sense inspired1 and had privately waited for the finishing of a certain spire in the little town of ,philadelphia so that he might use it to get nearer to the clouds to demonstrate his theory of lightning4 ,it was in ,june1 #ageb1 that this great exemplar of the genius of common-sense descended to the trial of the experiment that was the simplest and the most ordinary and the most sublime2 the commonest in conception and means yet the most famous in results2 ever tried by man4 ,he had grown impatient of delay in the matter of the spire1 and hastily1 as by a sudden thought1 made a kite4 ,it was merely a silk handkerchief whose four corners were attached to the points of two crossed sticks4 ,it was only the idea that was great2 the means were infantile4 ,a thunder shower came over1 and in an interval between sprinklings he took with him his son1 and went by back ways and alleys to a shed in an open field4 ,the two raised the kite as boys did then and do now1 and stood within the shelter4 ,there was a hempen string1 and on this1 next his hand1 he had tied a bit of ribbon and an ordinary iron key4 ,a cloud passed over without any indications of anything whatever4 ,but it began to rain1 and as the string became wet he noticed that the loose filaments were standing out from it1 as he had often seen them do in his experiments with the electrical machine4 ,he drew a spark from the key with his finger1 and finally charged a ,leyden jar from this key1 and performed all the then known proof-experiments with the lightning drawn from heaven4 ,it is manifest that the slightest indication of the presence of the current in the string was sufficient to have demonstrated the fact which ,franklin sought to fix4 ,but it would have been insufficient to the general mind4 ,the demonstration required was absolute4 ,even among scientists of the first class less was then known about electricity and its phenomena1 and the causes of them1 than now is known by every child who has gone to school4 ,no estimate of the boldness and value of ,franklin's renowned experiment can be made without a full appreciation of his times and surroundings4 ,he demonstrated that which was undreamed before1 and is undoubted now4 ,the wonders of one age have been the toys and tools of the next through the entire history of mankind4 ,the meaning of the demonstration was deep2 its results were lasting ,the experimenters thereafter worked with a knowledge that their investigations must1 in a sense1 include the universe4 ,perhaps the obscure man who had toyed with the lightnings himself but vaguely understood the real meaning of his temerity4 ,for he had1 as usual1 an intensely practical purpose in view4 ,he wished to find a way of drawing from the heavens their lightnings1 and conducting them harmless to the earth4 ,he was the first inventor of a practical machine1 for a useful purpose1 with which electricity had to do4 ,that machine was the lightning-rod4 ,whatever its purpose1 mankind will not forget the simple greatness of the act4 ,at this writing the statue of ,franklin stands looking upward at the sky1 a key in his extended hand1 in the portico of a palace which contains the completest and most beautiful display of electrical appliances that was ever brought together1 at the dawn of that ,age of ,electricity which will be noon with us within one decade4 ,the science and art of the civilized world are gathered about him1 and on the frieze above his head shines1 in gold letters1 that sentence which is a poem in a single line4 ,,eripuit ,,caelo ,,fulmen1 ,,sceptrumque ,,tyrannis4 ,footnote3 ,he snatched the lightning from heaven1 and the sceptre from tyrants4 99 99 99 99 99 ,,the ,,man ,,franklin4--,benjamin ,franklin was born at ,boston1 ,mass41 ,jan4 #agth1 #agjf4 ,his father was a chandler1 a trade not now known by that term1 meaning a maker of soaps and candles4 ,benjamin was the fifteenth of a family of seventeen children4 ,he was so much of the same material with other boys that it was his notion to go to sea1 and to keep him from doing so he was apprenticed to his brother1 who was a printer4 ,to be apprenticed then was to be absolutely indentured2 to belong to the master for a term of years4 ,strangely enough1 the boy who wanted to be a sailor was a reader and student1 captivated by the style of the ,spectator1 a model he assiduously cultivated in his own extensive writings afterwards4 ,he was not assisted in his studies1 and all he ever knew of mathematics he taught himself4 ,being addicted to literature by natural proclivity he inserted his own articles in his brother's newspaper1 and these being very favorably commented upon by the local public1 or at least noticed and talked about1 his authorship of them was discovered1 and this led to a quarrel between the two brothers4 ,nevertheless1 when ,james1 the elder brother1 was imprisoned for alleged seditious articles printed by him1 the paper was for a time issued in young ,benjamin's name4 ,but the quarrel continued1 the boy was imposed upon by his master1 and brother1 as naturally as might have been expected under the circumstances of the younger having the monopoly of all the intellectual ability that existed between the two1 and in #agbc1 being then only seventeen1 he broke his indentures1 a heinous offense in those times1 and ran away1 first to ,new ,york and then to ,philadelphia1 where he found employment as a journeyman printer4 ,he had attained a skill in the business not usual at the time4 ,the boy had1 up to this time1 read everything that came into his hands4 ,a book of any kind had a charm for him4 ,his father observing this had intended him for the ministry1 that being the natural drift of a pious father's mind in the time of ,franklin's youth1 when he discovered any inclination to books on the part of a son4 ,but1 later1 he would neglect the devotions of the ,sabbath if he had found a book1 notwithstanding the piety of his family4 ,sometimes he distressed them further by neglecting his meals1 or sitting up at night1 for the same reason4 ,there is no question that young ,franklin was a member of that extensive fraternity now known as cranks4 ,footnote3 ,most people1 then and now1 can point to people of their acquaintance whom they hold in regard as originals or eccentrics4 ,it is a somewhat dubious title for respect1 even with us who are reckoned so eccentric a nation4 ,and yet all the great inventions which have done so much for civilization have been discovered by eccentrics--that is1 by men who stepped out of the common groove2 who differed more or less from other men in their habits and ideals4 ,he read a book advocating exclusive subsistence upon a vegetable diet and immediately adopted the idea1 remaining a disciple of vegetarianism for several years4 ,but there is another reason hinted4 ,he saved money by the vegetable scheme1 and when his printer's lunch had consisted of biscuits 7crackers7 and water for some days1 he had saved money enough to buy a new book4 ,this young printer1 who1 at school1 in the little time he attended one1 had failed entirely in mathematics1 could assimilate ,locke on the ,understanding1 and appreciate a translation of the ,memorabilia of ,xenophon4 ,even after his study of this latter book he had a fondness for the calm reasoning of ,socrates1 and wished to imitate him in his manner of reasoning and moralizing4 ,there is no question but that the great heathen had his influence across the abyss of time upon the mind of a young ,american destined also to fill1 in many respects1 the foremost place in his country's history4 ,there was one1 at least1 who had no premonition of this4 ,his brother chastised him before he had been imprisoned1 and after he had begun to attract attention as a writer in one of the only two newspapers then printed in ,america1 and beat him again after he was released1 having meantime been vigorously defended by his apprentice editorially while he languished4 ,to have beaten ,benjamin ,franklin with a stick1 when he was seventeen years old1 seems an absurd anti-climax in ,american history4 ,but it is true1 and when the young man ran away there was still another odd episode in a great career4 ,upon his first arrival in ,philadelphia as a runaway apprentice1 with one piece of money in his pocket1 occurs the one gleam of romance in ,franklin's seemingly ,socratic life4 ,he says he walked in ,market ,street with a baker's loaf under each arm1 with all his shirts and stockings bulging in his pockets1 and eating a third piece of bread as he walked1 and this on a ,sunday morning4 ,under these circumstances he met his future wife1 and he seems to have remembered her when next he met her1 and to have been unusually prepossessed with her1 because on the first occasion she had laughed at him going by4 ,he was one of those whose sense of humor bears them through many difficulties1 and who are even attracted by that sense in others4 ,he was1 at this period1 absurd without question4 ,having eaten all the bread he could1 and bestowed the remainder upon another voyager1 he drank out of the ,delaware and went to church2 that is1 he sat down upon a bench in a ,quaker meeting-house and went to sleep1 and was admonished thence by one of the brethren at the end of the service4 ,franklin had1 in the time of his youth1 the usual experiences in business4 ,he made a journey to ,london upon promises of great advancement in business1 and was entirely disappointed1 and worked at his trade in ,london4 ,afterwards1 during the return voyage to ,america1 he kept a journal1 and wrote those celebrated maxims for his own guidance that are so often quoted4 ,the first of these is the gem of the collection3 ,i resolve to be extremely frugal for some time1 until ,i pay what ,i owe4 ,a second resolve is scarcely less deserving of imitation1 for it declares it to be his intention to speak all the good ,i know of everybody4 ,it must be observed that ,franklin was afterwards the great maximist of his age1 and that his life was devoted to the acquisition of worldly wisdom4 ,in his body of philosophy there is included no word of confidence in the condemnation of offenses by the act or virtue of another1 no promise of1 or reference to1 the rewards of futurity4 ,when about twenty-one years of age1 we find this old young man tired of a drifting life and many projects1 and desiring to adopt some occupation permanently4 ,he had courted the girl who had laughed at him1 and then gone to ,england and forgotten her4 ,she had meantime married another man1 and was now a widow4 ,in #agcj he married her4 ,meantime1 entering into the printing business on his own account1 he often trundled his paper along the streets in a wheelbarrow1 and was intensely occupied with his affairs4 ,his acquisitive mind was never idle1 and in #agcb he began the publication of the celebrated ,poor ,richard's ,almanac4 ,this was among the most successful of all ,american publications1 was continued for twenty-five years1 and in the last issue1 in #ageg1 he collected the principal matter of all preceding numbers1 and the issue was extensively republished in ,great ,britain1 was translated into several foreign languages1 and had a world-wide circulation4 ,he was also the publisher of a newspaper1 ,the ,pennsylvania ,gazette1 which was successful and brought him into high consideration as a leader of public opinion in times which were beginning to be troubled by the questions that finally brought about a separation from the mother country4 ,time and space would fail in anything like a detailed account of the life of this remarkable man4 ,his only son1 the boy who was with him at the flying of the kite1 was an illegitimate child1 and it is a remarkable instance of unlikeness that this only son became a royalist governor of ,new ,jersey1 was never an ,american in feeling1 and removed to ,england and died there4 ,the sum of ,franklin's life is that he was a statesman1 a financier of remarkable ability1 a skillful diplomat1 a law-maker1 a powerful and felicitous writer though without imagination or the literary instinct1 and a controversialist who seldom1 if ever1 met his equal4 ,he was always a printer1 and at no period of his great career did he lose his affection for the useful arts and common interests of mankind4 ,he is the founder of the ,american ,philosophical ,society1 and of a college which grew into the present ,university of ,pennsylvania4 ,to him is due the origin of a great hospital which is still doing beneficent work4 ,he raised1 and caused to be disciplined1 ten thousand men for the defense of the country4 ,he was a successful publisher of the literature of the common people1 yet a literature that was renowned4 ,he could turn his attention to the improvement of chimneys1 and invented a stove still in use1 and still bearing his name as the author of its principle4 ,footnote3 ,the stove was not used in ,franklin's time to any extent4 ,the ,franklin ,stove was a fireplace so far as the advantages were concerned1 such as ventilation and the pleasure of an open fire4 ,but it also radiated heat from the back and sides as well as the front1 and was intended to sit further out into a room2 to be both fireplace and stove4 ,he organized the postal system of the ,united ,states before the ,union existed4 ,he was a signer of the ,declaration of ,independence4 ,he sailed as commissioner to ,france at the age of seventy-one1 and gave all his money to his country on the eve of his departure1 yet died wealthy for his time4 ,serene1 even-tempered1 philosophical1 he was yet far-seeing1 care-taking1 sagacious1 and intensely industrious4 ,he acquired a knowledge of the ,italian and ,spanish languages1 and was a proficient ,french speaker and writer4 ,he possessed1 in an extraordinary degree1 the power of gaining the regard1 even the affection1 of his fellow-men4 ,he was even a competent musician1 mastering every subject to which his attention was turned2 and province-born and reared in the business of melting tallow and setting types1 without collegiate education1 he shone in association with the men and women who had place in the most brilliant epoch of ,french intellectual history4 ,at fourscore years he performed the work that would have exhausted a man of forty1 and at the same time wrote1 for mere amusement1 sketches such as the ,dialogue between ,franklin and the ,gout1 and added1 with the cool philosophy of all his life still lingering about his closing hours3 ,when ,i consider how many terrible diseases the human body is liable to1 ,i think myself well off that ,i have only three incurable ones1 the gout1 the stone1 and old age4 ,illustration3 ,,the ,,franklin ,,stove4 99 99 99 99 99 ,after ,franklin1 electrical experiments went on with varying results1 confined within what now seems to have been a very narrow field1 until #agij4 ,the great facts outside of the startling disclosure made by ,franklin's experiments remained unknown4 ,it was another forty years of amused and interested playing with a scientific toy4 ,but in that year the key to the utility of electricity was found by one ,galvani4 ,he was not an electrician at all1 but a professor of anatomy in the university of ,bologna4 ,it may be mentioned in passing that he never knew the weight or purport of his own discovery1 and died supposing and insisting that the electric fluid he fancied he had discovered had its origin in the animal tissues4 ,misapprehending all1 he was yet unconsciously the first experimenter in what we1 for convenience1 designate dynamic electricity4 ,he knew only of animal electricity1 and called it by that name2 a misnomer and a mistake of fact1 and the cause of an early scientific quarrel the promoting of which was the actual reason of the advance that was made in the science following his accidental and enormously important discovery4 ,there are many stories of the details of the ordinarily entirely unimportant circumstances that led to ,galvanism and the ,galvanic ,battery4 ,volta actually made this battery1 then known as the ,voltaic ,pile1 but he made it because of ,galvani's discovery4 ,the reader is requested to bear these names in mind2 ,galvani and ,volta4 ,they have a unique claim upon us4 ,with others that will follow1 they have descended to all posterity in the immortal nomenclature of the science of electricity4 ,it is through the accidental discovery of the plodding demonstrator of anatomy in a medical college1 a man who died at last in poverty and in ignorance of the meaning of his own work1 that we have now the vast web of telegraph and telephone wires that hangs above the paths of men in every civilized country1 and the cables that lie in the ooze of the oceans from continent to continent4 ,his discovery was the result of one of the commonest incidents of domestic life4 ,variously described by various writers1 the actual circumstance seems reducible to this4 ,in ,galvani's kitchen there was an iron railing1 and immediately above the railing some copper hooks1 used for the purpose of hanging thereon uncooked meats4 ,his wife was an invalid1 and wishing to tempt her appetite he had prepared a frog by skinning it1 and had hung it upon one of the copper hooks4 ,the only use intended to be asked of this renowned batrachian was the making of a little broth4 ,another part of the skinned anatomy touched the iron rail below1 and the anatomist observed that this casual contact produced a convulsive twitching of the dead reptile's legs4 ,he groped about this fact for many years4 ,he fancied he had discovered the principle of life4 ,he made the phenomenon to hang upon the facts clustering about his own profession1 familiar to him1 and about which it was natural for him to think4 ,he promulgated theories about it that are all now absurd1 however tenable then4 ,his was an instance of how the fatuities of men in all the fields of science1 faith or morals1 have often led to results as extraordinary as they have been unexpected4 ,that he died in poverty in #agih is a mere human fact4 ,that in this life he never knew is merely another4 ,it is but a part of that sadness that1 through life1 and1 indeed1 through all history1 hangs over the earthly limitations of the immortal mind4 ,volta1 his contemporary and countryman1 finally solved the problem as to the reason why4 and made that ,voltaic ,pile which came to be our modern battery4 ,acting upon the hint given by ,galvani's accident1 this pile was made of thin sheets of metal1 say of copper and zinc1 laid in series one above the other1 with a piece of cloth wet with dilute acid interposed between each sheet and the next4 ,the sheets were connected at the edges in pairs1 a sheet of zinc to a sheet of copper1 and the pile began with a sheet of one metal and ended with one of the other4 ,it is to be noted that a single pair would have produced the same result as a hundred pairs1 only more feebly4 ,a single large pair is1 indeed1 the modern electric battery of one cell4 ,the beginning and the ending sheets of the ,voltaic pile were connected by a wire1 through which the current passed4 ,we1 in our commonest industrial battery1 use the two pieces of metal with the fluid between4 ,the metals are usually copper and zinc1 and the fluid is water in which is dissolved sulphate of copper4 ,the wire connection we make hundreds of miles long1 and over this wire passes the current4 ,if we part this wire the current ceases4 ,if we join it again we instantly renew it4 ,there are many forms of this battery4 ,the two metals1 the electrodes1 are not necessarily zinc and copper and no others4 ,the acidulated fluid is not invariably water with sulphate of copper dissolved in it4 ,yet in all modifications the same thing is done in essentially the same way1 and the ,voltaic pile1 and a little back of that ,galvani's frog1 is the secret of the telegraph1 the telephone1 the telautograph1 the cable message4 ,in the case of ,galvani's frog1 the fluids of the recently killed body furnished the liquid containing the acid1 the copper hook and the iron railing furnished the dissimilar metals1 and the nerves and muscles of the frog's body1 connecting the two metals1 furnished the wire4 ,they were as good as ,franklin's wet string was4 ,the effect of the passage of a current of electricity through a muscle is to cause it to spasmodically contract1 as everyone knows who has held the metallic handles of an ordinary small battery4 ,many years passed before the mystery that has long been plain was solved by acute minds4 ,galvani thought he saw the electric quality in the tissues of the frog4 ,volta came to see them as produced by chemical action upon two dissimilar metals4 ,the first could not maintain his theories against facts that became apparent in the course of the investigations of several years1 yet he asserted them with all the pertinacious conservatism of his profession1 which it has required ages to wear away1 and died poor and unhonored4 ,the other became a nobleman and a senator1 and wore medals and honors4 ,it is a world in which success alone is seen1 and in which it may be truthfully said that the contortions of an eviscerated and unconscious frog upon a casual hook were the not very remote cause of the greatest advancements and discoveries of modern civilization4 ,yet the mystery is not yet entirely explained4 ,in the study of electricity we are accustomed to accept demonstrated facts as we find them4 ,when it is asked how a battery acts1 what produces the mysterious current1 the only answer that can now be given is that it is by the conversion of the energy of chemical affinity into the energy of electrical vibrations4 ,many mixtures produce heat4 ,the explanation can be no clearer than that for electricity4 ,electricity and heat are both forms of energy1 and1 indeed1 are so similar that one is almost synonymous with the other4 ,the enquiry into the original sources of energy1 latent but present always1 will1 when finally answered1 give us an insight into mysteries that we can only now infer are reserved for that hereafter1 here or elsewhere1 which it is part of our nature to believe in and hope for4 ,the theory of electrical vibrations is explained elsewhere as the only tenable one by which to account for electrical action4 ,one may also ask how fire burns1 or1 rather1 why a burning produces what we call heat1 and the actual question cannot be answered4 ,the action of fire in consuming fuel1 and the action of chemicals in consuming metals1 are similar actions4 ,they each result in the production of a new form of energy1 and of energy in the form of vibrations4 ,in the action of fire the vibrations are irregular and spasmodic2 in electricity they are controlled by a certain rhythm or regularity4 ,between heat and electricity there is apparently only this difference1 and they are so similar1 and one is so readily converted into the other1 that it is a current scientific theory that one is only a modified form of the other4 ,many acute minds have reflected upon the problem of how to convert the latent energy of coal into the energy of electricity without the interposition of the steam engine and machinery4 ,there apparently exist reasons why the problem will never be solved4 ,there is no intelligence equal to answering the question as to precisely where the heat came from1 or how it came1 that instantly results upon the striking of a common match4 ,it was evolved through friction4 ,the means were necessary4 ,friction1 or its precise equivalent in energy1 must occur4 ,the result is as strange1 and in the same manner strange1 as any of the phenomena of electricity4 ,precisely here1 in the beginning of the study of these phenomena1 the student should be warned that an attitude of wonder or of awe is not one of enquiry4 ,the demonstrations of electricity are startling chiefly for three reasons3 newness1 silence1 and inconceivable rapidity of action4 ,let one hold a wire in one's hand six or eight inches from the end1 and then insert that end into the flame of a gas-jet4 ,it is as old as human experience that that part of the wire which is not in the flame finally grows hot1 and burns one's fingers4 ,a change has taken place in the molecules of the wire that is not visible1 is noiseless1 and that has traveled along the wire4 ,it excites neither wonder nor remark4 ,no one asks the reason why4 ,yet it cannot be explained except by some theory more or less tenable1 and the phenomenon1 in kind though not in degree1 is as unaccountable as anything in the magic of electricity4 ,in a true sense there is1 nothing supernatural1 or even wonderful1 in all the vast universe of law4 ,if we would learn the facts in regard to anything1 it must be after we have passed the stage of wonder or of reverence in respect to it4 ,that which was the ,voice of ,god--as truly1 in a sense1 it was and is--until ,franklin's day1 has since been a concussion of the air1 an echo among the clouds1 the passage of an electric discharge4 ,it is the first lesson for all those who would understand4 ,the time had now come when that which had seemed a lawless wonder should have its laws investigated1 formulated and explained4 ,a man named ,coulomb1 a ,frenchman1 is the author of a system of measurements of the electric current1 and he it was who discovered that the action of electricity varies1 not with the distance1 but1 like gravity1 in the inverse ratio of the square of the distance4 ,coulomb was the maker of the first instrument for measuring a current1 which was known as the torsion balance4 ,the results of his practical investigations made easier the practical application of electrical power as we now use it1 though he foresaw nothing of that application2 and the engineer of to-day applies his laws1 and those of his fellow scientists1 as those which do not fail4 ,volta was one of these1 and he also furnished1 as will hereafter be seen1 a name for one of the units of electrical measurement4 ,both ,galvani and ,volta passed into shadow1 when1 in #ahbj1 ,professor ,h4 ,c4 ,oersted1 of ,copenhagen1 discovered the law upon which were afterwards slowly built the electrical appliances of modern life4 ,it was the great principle of ,,induction4 ,the student of electricity may begin here if he desires to study only results1 and is not interested in effects1 causes1 and the pains and toils which led to those results4 ,the term may seem obscure1 and is1 doubtless1 as a name1 the result of a sudden idea2 but upon induction and its laws the simplest as well as the most complicated of our modern electrical appliances depend for a reason for action4 ,its discovery set ,ampre to work4 ,they had all imagined previously that there was some connection between electricity and magnetism1 and it was this idea that instigated the investigations of ,ampere4 ,it was imagined that the phenomena of electricity were to be explained by magnetism4 ,this was not untrue1 but it was only a part of the truth4 ,ampere proved that magnetism could also readily be produced by a current of electricity4 ,from this idea1 practically carried out1 grew the ,,electro ,,magnet1 and to ,ampre we are indebted for the actual discovery of the elementary principles of what we now call electrodynamics1 or dynamic electricity1 ,footnote3 ,in all science there is a continual going back to the past for a means of expression for things whose application is most modern4 ,dynamic2 ,,dynamo1 is the ,greek word for power2 to be able4 ,once established1 these names are seldom abandoned4 ,there is no more reason for calling our electrical power-producing machine a ,dynamo than there would be in so designating a steam engine or a water-wheel4 ,but1 a term of general significance if used at all1 it has come to be the special designation of that one machine4 ,it is brief1 easily said1 and to the point1 but is in no way necessarily connected with electrical power distinctively4 in which are included the ,dynamo1 and its twin and indispensable1 the ,motor4 ,ampre is also the author of the molecular theory1 by which alone1 with our present knowledge1 can the action of electricity be explained in connection with the iron core which is made a magnet by the current1 and left again a mere piece of iron when the current is interrupted4 ,ten years later ,faraday explained and applied the laws of ,induction1 basing them upon the demonstrations of ,ampre4 ,the use of a core of soft iron1 magnetized by the passage of a current through a helix of wire wrapping it as the thread does a spool1 is the indispensable feature1 in some form meaning the same thing1 with the same results1 in all machines that are given movement to by an electric current4 ,this is the electro-magnet4 ,it is made a magnet not by actual contact1 or by being made the conductor of a current1 but by being placed in the electrical field and temporarily magnetized by induction4 ,faraday began his brilliant series of experiments in #ahca4 ,to express briefly the laws of action under which he worked1 he wrote the celebrated statement of the ,law of ,magnetic ,force4 ,he proved that the current developed by induction is the same in all its qualities with other currents1 and1 indeed1 demonstrated ,franklin's theory that all electricity is the same2 that1 as to kind1 there is but one4 ,all electrical action is now viewed from the ,faradic position4 ,the story of electricity1 as men studied it in the primary school of the science1 ends where ,faraday began4 ,under the immutable laws he discovered and formulated we now enter the field of result1 of action1 of commercial interest and value4 ,we might better say the field of usefulness1 since commercial value is but another expression for usefulness4 ,a revolution has been wrought in all the ways and thoughts of men since a date which a man less than sixty years old can recall4 ,the laws under which the miracle has been wrought existed from all eternity4 ,they were discovered but yesterday4 ,progress1 the destiny of man1 has kept pace in other fields4 ,we live our time in our predestined day1 learning and knowing1 like grown-up children1 what we may4 ,in a future whose distance we may not even guess1 the children of men shall reap the full fruition of the prophesy that has grown old in waiting1 and shall be as gods1 knowing good from evil4 ,,modern ,,electricity ,,chapter ,i4 ,electricity1 in all its visible exhibitions1 has certain unvarying qualities4 ,some of these have been mentioned in the preceding chapter4 ,others will appear in what is now to follow4 ,these qualities or habits1 invariable and unchangeable1 are1 briefly3 7#a7 ,it has the unique power of drawing1 attracting other objects at a distance4 7#b7 ,for all human uses it is instantaneous in action1 through a conductor1 at any distance4 ,a current might be sent around the world while the clock ticked twice4 7#c7 ,it has the power of decomposing chemicals 7,electrolysis71 and it should be remembered that even water is a chemical1 and that substances composed of one pure organic material are very rare4 7#d7 ,it is readily convertible into heat in a wire or other conductor4 ,these four qualities render its modern uses possible1 and should be remembered in connection with what is presently to be explained4 ,these uses are1 in application1 the most startling in the entire history of civilization4 ,they have come about1 and their applications have been made effective1 within twenty years1 and largely within ten4 ,this subtlest and most elusive essence in nature1 not even now entirely understood1 is a part of common life4 ,some years ago we began to spell our thoughts to our fellow-men across land and sea with dots and dashes4 ,within the memory of the present high school boy we began to talk with each other across the miles4 ,now there is no reason why we shall not begin to write to each other letters of which the originals shall never leave our hands1 yet which shall stand written in a distant place in our own characters1 indisputably signed by us with our own names4 ,we apparently produce out of nothing but the whirling of a huge bobbin of wire any power we may wish1 and send it over a thin wire to where we wish to use it1 though every adult can remember when the difficulty of distance1 in the propelling of machinery1 was thought to have been solved to the satisfaction of every reasonable man by the making of wire cables that would transmit power between grooved wheels a distance of some hundreds of feet4 ,we turn night into day with the glow of lamps that burn without flame1 and almost without heat1 whose mysterious glow is fed from some distant place1 that hang in clusters1 banners1 letters1 in city streets1 and that glow like new stars along the treeless prairie horizon where thirty years ago even the beginnings of civilization were unknown4 ,yet the mysterious agent has not changed4 ,it is as it was when creation began to shape itself out of chaos and the abyss4 ,men have changed in their ability to reason1 to deduce1 to discover1 and to construct4 ,to know has become a part of the sum of life2 to understand or to abandon is the rule4 ,when the ages of tradition1 of assertion without the necessity for proof1 of content with all that was and was right or true because it was a standard fixed1 went by1 the age not necessarily of steam1 or of steel1 or of electricity1 but the age of thought1 came in4 ,some of the results of this thought1 in one of the most prominent of its departments1 ,i shall attempt to describe4 ,a wire is the usual concomitant in all electrical phenomena4 ,it is almost the universally used conductor of the current4 ,in most cases it is of copper1 as pure as it can be made in the ordinary course of manufacture4 ,there are other metals that conduct an electrical current even better than copper does1 but they happen to be expensive ones1 such as silver4 ,the usual telegraph-line is efficient with only iron wire4 ,we habitually use the words conductor and conduct in reference to the electric current4 ,a definition of that common term may be useful4 ,it is a relative one4 ,a conductor is any substance whose atoms1 or molecules1 have the power of conveying to each other quickly their electricities4 ,before the common use of electricity we were accustomed to commonly speak of conductors of heat2 good1 or poor4 ,the same meaning is intended in speaking of conductors of electricity4 ,non-conductors are those whose molecules only acquire this power under great pressure4 ,electricity always takes the easiest road1 not necessarily the shortest4 ,this is the path that electricians call that of least resistance4 ,there are no absolutely perfect conductors1 and there are no substances that may be called absolutely non-conductors4 ,a non-conductor is simply a reluctant1 an excessively slow1 conductor4 ,in all electrical operations we look first for these two essentials3 a good conductor and a good non-conductor4 ,we want the latter as supports and attachments for the first4 ,if we undertake to convey water in a pipe we do not wish the pipe to leak4 ,in conveying electricity upon a wire we have a little leak wherever we allow any other conductor to come too near1 or to touch1 the wire carrying the current4 ,these little electrical leaks constantly exist4 ,all nature is in a conspiracy to take it wherever it can find it1 and from everything which at the moment has more than some other has1 or more than its share with reference to the air and the world1 of the mysterious essence that is in varying quantities everywhere4 ,glass is the usual non-conductor in daily use4 ,a glance at the telegraph poles will explain all that has just been said4 ,water in large quantity or widely diffused is a fair conductor4 ,therefore1 the glass insulators on the telegraph-poles are cup-shaped usually on the under side where the pin that holds them is inserted1 so that the rain may not actually wet this pin1 and thus make a water-connection between the wire1 glass1 pin1 pole and ground4 ,we are accustomed to things that are subject to the law of gravity4 ,water will run through a pipe that slants downward4 ,it will pass through a pipe that slants upward only by being pushed4 ,but electricity1 in its far journeys over wires1 is not subject to gravity4 ,it goes indifferently in any direction1 asking only a conductor to carry it4 ,there is also a trait called inertia2 that property of all matter by which it tends when at rest to remain so1 and when in motion to continue in motion1 which we meet at every step we take in the material world4 ,electricity is again an exception4 ,it knows neither gravity1 nor inertia1 nor material volume1 nor space4 ,it cannot be contained or weighed4 ,nothing holds it in any ordinary sense4 ,it is difficult to express in words the peculiar qualities that caused the early experimenters to believe it had a soul4 ,it is never idle1 and in its ceaseless journeyings it makes choice of its path by a conclusion that is unerring and instantaneous4 ,we find that it is the constant endeavor of electricity to equalize its quantities and its two qualities1 in all substances that are near it that are capable of containing it4 ,to this end1 seemingly by definite intention1 it is found on the outsides of things containing it4 ,it gathers on the surfaces of all conductors4 ,if there are knobs or points it will be found in them1 ready to leap off4 ,when any electrified body is approached by a conductor1 the fluid will gather on the side where the approach is made4 ,if in any conductor the current is weak1 very little of it1 if any1 will go off into the conductor before actual contact is made4 ,if it is strong1 it will often leap across the space with a spark4 ,one body may be charged with positive1 and another with negative1 electricity4 ,there is then a disposition to equalize that cannot be easily repressed4 ,the positive and the negative will assume their dual functions1 their existence together1 in spite of obstacles4 ,so as to quantity4 ,that which has most cannot be restrained from imparting to that which has less4 ,the demonstration of these facts belongs to the field of experimental1 or laboratory1 electricity4 ,the most common of the visible experiments is on a vast scale4 ,it is the thunder-storm4 ,mother ,earth is the great depository of the fluid4 ,the heavy clouds1 as they gather1 are likewise full4 ,across the space that lies between the exchange takes place--the lightning-flash4 ,in the preceding chapter ,i have hastily alluded to the phenomenon known as the key to electricity as a utilitarian science2 a means of material usefulness4 ,these uses are all made possible under the laws of what we term ,,induction4 ,to comprehend this remarkable feature of electric action1 it must first be understood that all electrical phenomena occur in what has been termed an ,electrical ,field ,this field may be illustrated simply4 ,a wire through which a current is passing is always surrounded by a region of attractive force4 ,it is scientifically imagined to exist in the form of rings around the wire4 ,in this field lie what are termed lines of force4 ,the law as stated is that the lines in which the magnetism produced by electricity acts are always at right angles with the direction in which the current is passing4 ,let us put this in ordinary phrase1 and say that in a wire through which a current is passing there is a magnetic attraction1 and that the pull is always straight toward the wire4 ,this magnetism in a wire1 when it is doubled up and multiplied sufficiently1 has strong powers of attraction4 ,this multiplying is accomplished by winding the wire into a compact coil and passing a current through it4 ,if one should wind insulated wire around a core1 or cylinder1 and should then pull out the cylinder and attach the two ends of the wire to the opposite poles of a battery1 when the current passed through the coil the hollow interior of it would be a strong magnetic field4 ,the air inside might be said to be a magnet1 though if there were no air there1 and the coil were under the exhausted receiver of an air-pump1 the effect would be the same1 and the vacuum would be magnetized4 ,a piece of iron inserted where the core was1 would instantly become a magnet1 and when the insulated wire is wound around a soft iron core1 and the core is left in place1 we have at once what is known as an ,electro-,magnet4 ,the wire windings of an electro-magnet are always insulated2 wound with a non-conductor1 like silk or cotton2 so that the coils may not touch each other in the winding and thus permit the current to run off through contact by the easiest way1 and cut across and leave most of the coil without a current4 ,for it may as well be stated now that no matter how good a conductor a wire may be1 two qualities of it cause what is called resistance--the current does not pass so easily4 ,these two qualities are thinness and length4 ,the current will not traverse all the length of a long coil if it can pass straight through the same mass1 and it is made to go the long way by keeping the wires from touching each other--preventing contact1 and lessening the opportunity to jump off which electricity is always looking for4 ,when this coil is wound in layers1 like the thread upon a spool1 it increases the intensity of the magnetism in the core by as many times as there are coils1 up to a certain point4 ,if the core is merely soft iron1 and not steel1 it becomes magnetized instantly1 as stated1 and will draw another piece of iron to it with a snap1 and hold it there as long as there is a current passing through the coil4 ,but as instantly1 when the current is stopped1 this soft iron core ceases to be a magnet1 and becomes as it was before--an inert and ordinary piece of iron4 ,what has just been described is always1 in some form1 one of the indispensable parts of the electromagnetic machines used in industrial electricity1 and in all of them except the appliances of electric lighting1 and even in that case it is indispensable in producing the current which consumes the points of the carbon1 or heats the filament to a white glow4 ,the current may traverse the wire for a hundred miles to reach this little coil4 ,but1 instantly1 at a touch a hundred miles away that forms a contact1 there is a continuous circuit2 the core becomes a magnet1 and the piece of iron near it is drawn suddenly to it4 ,remove the distant finger from the button1 the contact is broken1 and the piece of iron immediately falls away again4 ,it is the wonder of the production of instant movement at any distance1 without any movement of any connecting part4 ,it is a mysterious and incredible transmission of force not included among human possibilities forty years ago4 ,it is now common1 old1 familiar4 ,conceive of its possibilities1 of its annihilation of time and space1 of its distant control1 and of that which it is made to mean and represent in the spelled-out words of language1 and it still remains one of the wonders of the world3 the ,electric ,telegraph4 99 99 99 99 99 ,,magnets ,,and ,,magnetism4--,having described a magnet that is made and unmade at will1 it may be appropriate to describe magnets generally4 ,the ordinary1 permanent magnet1 natural or artificial1 has little place in the arts4 ,it cannot be controlled4 ,in common phrase1 it cannot be made to let go at will4 ,the greatest value of magnetism1 as connected with electricity1 consists in the fact of the intimate relationship of the two4 ,a magnet may be made at will with the electric current1 as described above4 ,a little later we shall see how the process may be reversed1 and the magnet be made to produce the most powerful current known1 and yet owe its magnetism to the same current4 ,the word ,magnet comes from the country of ,magnesia1 where loadstone 7magnetic iron ore7 seems first to have been found4 ,the artificial magnet1 as made and used in early experiments and still common as a toy or as a piece in some electrical appliances1 is a piece of fine steel1 of hard temper1 which has been magnetized1 usually by having had a current passed through or around it1 and sometimes by contact with another magnet4 ,for the singular property of a magnet is that it may continually impart its quality1 yet never lose any of its own4 ,steel alone1 of all the metals1 has the decided quality of retaining its property of being a magnet4 ,a bar magnet is a straight piece of steel magnetized4 ,a horseshoe magnet is a bar magnet bent into the form of the letter ,u4 ,every magnet has two poles--the positive1 or ,north pole1 and the negative1 or ,south pole4 ,if any magnet1 of any size1 and having as one piece two poles only1 be cut into two1 or a hundred pieces1 each separate piece will be like the original magnet and have its two poles4 ,the law is arbitrary and invariable under all circumstances1 and is a law of nature1 as unexplainable and as invariable as any in that mysterious code4 ,all bar magnets1 when suspended by their centers1 turn their ends to the ,north and ,south1 a familiar example of this being the ordinary compass4 ,but in magnetism1 like repels like4 ,the world is a huge magnet4 ,the pole of the magnet which points to the ,north is not the ,north pole of the needle as we regard it1 but the opposite1 the ,south4 ,no one can explain precisely why iron1 the purer and softer the better1 becomes a powerful and effective magnet under the influence of the current1 and instantly loses that character when the current ceases1 and why steel1 the purer and harder the better1 at first rejects the influence1 and comes slowly under it1 but afterwards retains it permanently4 ,iron and steel are the magnetic metals1 but there is a considerable list of metals not magnetic that are better than they as conductors of the electric current4 ,in a certain sense they are also the electric metals4 ,a ,dynamo1 or ,motor1 made of brass or copper entirely would be impossible4 ,all the phenomena of combined magnetism and electricity1 all that goes to make up the field of industrial electric action1 would be impossible without the indispensable of ordinary iron1 and for the sole reason that it possesses the peculiar qualities1 the affinities1 described4 99 99 99 99 99 ,there is now an understanding of the electro-magnet1 with some idea of the part it may be made to play in the movement of pieces1 parts1 and machines in which it is an essential4 ,it has been explained how soft iron becomes a magnet1 not necessarily by any actual contact with any other magnet1 or by touching or rubbing1 but by being placed in an electric field4 ,it acquired its magnetism by induction2 by drawing in 7since that is the meaning of the term7 the electricity that was around it4 ,but induction has a still wider field1 and other characteristics than this alone4 ,some distinct idea of these may be obtained by supposing a simple case1 in which ,i shall ask the reader to follow me4 ,illustration3 ,,diagram ,,theory ,,of ,,induction ,let us imagine a wire to be stretched horizontally for a little space1 and its two ends to be attached to the two poles of an ordinary battery so that a current may pass through it4 ,another wire is stretched beside the first1 not touching it1 and not connected with any source of electricity4 ,now1 if a current is passed through the first wire a current will also show in the second wire1 passing in an opposite direction from the first wire's current4 ,but this current in the second wire does not continue4 ,it is a momentary impulse1 existing only at the moment of the first passing of the current through the wire attached to the poles of the battery4 ,after this first instantaneous throb there is nothing more4 ,but now cut off the current in the first wire1 and the second wire will show another impulse1 this time in the same direction with the current in the first wire4 ,then it is all over again1 and there is nothing more4 ,the first of these wires and currents1 the one attached to the battery poles1 is called the ,primary4 ,the second unattached wire1 with its impulses1 is called the ,secondary4 ,let us now imagine the primary to be attached to the battery-poles permanently4 ,we will not make or break the circuit1 and we can still produce currents1 impulses1 in the secondary4 ,let us imagine the primary to be brought nearer to the secondary1 and again moved away from it1 the current passing all the time through it4 ,every time it is moved nearer1 an impulse will be generated in the secondary which will be opposite in direction to the current in the primary4 ,every time it is moved away again1 an impulse in the secondary will be in the same direction as the primary current4 ,so long1 as before1 as the primary wire is quiet1 there will be no secondary current at all4 ,there is still a third effect4 ,if the current in the primary be increased or diminished we shall have impulses in the secondary4 ,this is a supposed case1 to render the facts1 the laws of induction1 clear to the understanding4 ,the experiment might actually be performed if an instrument sufficiently delicate were attached to the terminals of the secondary to make the impulses visible4 ,the following facts are deduced from it in regard to all induced currents4 ,they are the primary laws of induction3-- ,a current which begins1 which approaches1 or which increases in strength in the primary1 induces1 with these movements or conditions1 a momentary current in the opposite direction in the secondary4 ,a current which stops1 which retires1 or which decreases in strength in the primary1 induces a momentary current in the same direction with the current in the primary4 ,to make the results of induction effective in practice1 we must have great length of wire1 and to this end1 as in the case of the electro-magnet1 we will adopt the spool form4 ,we will suppose two wires1 insulated so as to keep them from actually touching1 held together side by side1 and wound upon a core in several layers4 ,there will then be two wires in the coil1 and the opposite ends of one of these wires we will attach to the poles of a battery1 and send a current through the coil4 ,this would then be the primary1 and the other would be the secondary1 as described above4 ,but1 since the power and efficiency of an induced current depends upon the length of the secondary wire that is exposed to the influence of the current carried by the primary1 we fix two separate coils1 one small enough to slip inside of the other4 ,this smaller1 inner coil is made with coarser wire than the outer1 and the latter has an immense length of finer wire4 ,the current is passed through the smaller1 inside coil1 and each time that it is stopped1 or started1 there will be an impulse1 and a very strong one1 through the outer--the secondary coil4 ,leave the current uninterrupted1 and move the outer coil1 or the inner one1 back and forth1 and the same series of strong impulses will be observed in the coil that has no connection with any source of electricity4 ,what ,i have just described as an illustration of the laws governing the production of induced currents1 is1 in fact1 what is known as the ,induction ,coil4 ,in the old times of a quarter of a century ago it was extensively used as an illustrator of the power of the electric current4 ,sometimes the outer coil contained fifty miles of wire1 and the spark1 a close imitation of a flash of lightning1 would pass between the terminals of the secondary coil held apart for a distance of several feet1 and would pierce sheets of plate glass three inches thick4 ,before the days of practical electric lighting the induction-coil was used for the simultaneous lighting of the gas-jets in public buildings1 and is still so used to a limited extent4 ,its description is introduced here as an illustration of the laws of induction which the reader will find applied hereafter in newer and more effective ways4 ,the commonest instance now of the use of the induction-coil is in the very frequent small machine known as a medical battery4 ,there must be a means of making and breaking the current 7the circuit7 as described above4 ,this1 in the medical battery1 is automatic1 and it is that which produces the familiar buzzing sound4 ,the mechanism is easily understood upon examination4 99 99 99 99 99 ,at some risk of tediousness with those who have already made an examination of elementary electricity1 ,i have now endeavored to convey to the reader a clear idea of 7#a71 what electricity is1 so far as known4 7#b7 ,of how the current is conducted1 and its influence in the field surrounding the conductor4 7#c7 ,the nature of the induced current1 and the manner in which it is produced4 ,the sum of the information so far may be stated in other words to be how to make an electromagnet1 and how to produce an induced current4 ,such information has an end in view4 ,a knowledge of these two items1 an understanding of the details1 will be found1 collectively or separately1 to underlie an understanding of all the machines and appliances of modern electricity1 and in all probability1 of all those that are yet to come4 ,but in the prominent field of electric lighting 7to which presently we shall come71 there is still another principle involved1 and this requires some explanation 7as well given here as elsewhere7 of the current theory as to what electricity is4 ,footnote3 ,there are several schools among scientists1 those who pursue pure science1 irrespective of practical applications1 and who are rather disposed to narrow the term to include that field alone1 that are divided among themselves upon the question of what electricity is4 ,the ,substantialists believe that it is a kind of matter4 ,others deny that1 and insist that it is a form of ,energy1 on which point there can be no serious question4 ,still others reject both these views4 ,tesla has said that nothing stands in the way of our calling electricity 'ether associated with matter1 or bound ether4' ,professor ,lodge says it is a form1 or rather a mode of manifestation1 of the ether ,the question is still in dispute whether we have only one electricity or two opposite electricities4 ,the great field of chemistry enters into the discussion as perhaps having the solution of the question within its possibilities4 ,the practical electrician acts upon facts which he knows are true without knowing their cause2 empirically2 and so far adheres to the molecular hypothesis4 ,the demonstrations and experiments of ,tesla so far produce only new theories1 or demonstrate the fallacies of the old1 but give us nothing absolute4 ,nevertheless1 under his investigations1 the possibilities of the near future are widely extended4 ,by means of currents alternating with very high frequency1 he has succeeded in passing by induction1 through the glass of #a lamp1 energy sufficient to keep a filament in a state of incandescence without the use of any connecting wires4 ,he has even lighted a room by producing in it such a condition that an illuminating appliance may be placed anywhere and lighted without being electrically connected with anything4 ,he has produced the required condition by creating in the room a powerful electrostatic field alternating very rapidly4 ,he suspends two sheets of metal1 each connected with one of the terminals of the coil4 ,if an exhausted tube is carried anywhere between these sheets1 or placed anywhere1 it remains always luminous4 ,something of the unquestionable possibilities are shown in the following quotation from ,nature1 as expressed in a lecture by ,prof4 ,crookes upon the implied results of ,tesla's experiments4 ,the extent to which this method of illumination may be practically available1 experiments alone can decide4 ,in any case1 our insight into the possibilities of static electricity has been extended1 and the ordinary electric machine will cease to be regarded as a mere toy4 ,alternating currents have1 at the best1 a rather doubtful reputation4 ,but it follows from ,tesla's researches that1 is the rapidity of the alternation increases1 they become not more dangerous but less so4 ,it further appears that a true flame can now be produced without chemical aid--a flame which yields light and heat without the consumption of material and without any chemical process4 ,to this end we require improved methods for producing excessively frequent alternations and enormous potentials4 ,shall we be able to obtain these by tapping the ether8 ,if so1 we may view the prospective exhaustion of our coal-fields with indifference2 we shall at once solve the smoke question1 and thus dissolve all possible coal rings4 ,electricity seems destined to annex the whole field1 not merely of optics1 but probably also of thermotics4 ,rays of light will not pass through a wall1 nor1 as we know only too well1 through a dense fog4 ,but electrical rays of a foot or two wave-length1 of which we have spoken1 will easily pierce such mediums1 which for them will be transparent4 ,another tempting field for research1 scarcely yet attacked by pioneers1 awaits exploration4 ,i allude to the mutual action of electricity and life4 ,no sound man of science indorses the assertion that electricity is life4 nor can we even venture to speak of life as one of the varieties or manifestations of energy4 ,nevertheless1 electricity has an important influence upon vital phenomena1 and is in turn set in action by the living being--animal or vegetable4 ,we have electric fishes--one of them the prototype of the torpedo of modern warfare4 ,there is the electric slug which used to be met with in gardens and roads about ,hoinsey ,rise2 there is also an electric centipede4 ,in the study of such facts and such relations the scientific electrician has before him an almost infinite field of inquiry4 ,the slower vibrations to which ,i have referred reveal the bewildering possibility of telegraphy without wires1 posts1 cables1 or any of our present costly appliances4 ,it is vain to attempt to picture the marvels of the future4 ,progress1 as ,dean ,swift observed1 may be too fast for endurance4 ,as to this1 all we may be said to know1 as has been remarked1 is that it is one of the forms of energy1 and its manifestations are in the form of motion of the minute and invisible atoms of which it is composed4 ,this movement is instantaneously communicated along the length of a conductor4 ,there must1 of course1 be an end to this process in theory1 because all the molecules once moved must return to rest1 or to a former condition1 before being moved again4 ,therefore it is necessary to add that when the motion of the last molecule has been absorbed by some apparatus for applying it to utility1 the last particles1 atoms1 molecules1 are restored to rest1 and may again receive motion from infringing particles1 and this transmission of energy along a conductor is continuous--continually absorbed and repeated4 ,this is dynamic electricity2 not differing in kind1 in essence1 from any other1 but only in application4 ,if the conductor is entirely insulated1 so that no molecular movements can be communicated by it to contiguous bodies1 all its particles become energized1 and remain so as long as the conductor is attached to a source of electricity4 ,in such a case an additional charge is required only when some of the original charge is taken away1 escapes4 ,this is ,static electricity2 the same as the other1 but in theory differing in application4 ,the molecular theory is1 unquestionably1 tenable under present conditions4 ,it is that to which science has attained in its inquiries to the present date4 ,the electric light is scarcely explainable upon any other hypothesis4 ,the remaining conclusions may be left in abeyance1 and without argument4 ,science began with static electricity1 so called1 because its sources were more readily and easily discovered in the course of scientific accidents1 as in the original discovery of the property of rubbed amber1 etc41 and the long course of investigations that were suggested by that antique1 accidental discovery4 ,what we know as the dynamic branch of the subject was created by the investigations of ,faraday2 induction was its mother4 ,it is the practically important branch1 but its investigation required the invention of machinery to perform its necessary operations4 ,between the two branches the sole difference--a difference that may be said not actually to exist--is in quantity and pressure4 ,to the department of static electricity all those industrial appliances first known belong1 as the telegraph1 electro-plating1 etc4 ,i shall first consider this class of appliances and machines4 ,the most important of the class is ,illustration ,,the ,,electric ,,telegraph4--,the word is ,greek1 meaning1 literally1 to write from a distance4 ,but long since1 and before ,morse's invention1 it had come to mean the giving of any information1 by any means1 from afar4 ,the existence of telegraphs1 not electric1 is as old as the need of them4 ,the idea of quickness1 speedy delivery1 is involved4 ,if time is not an object1 men may go or send4 ,the means used in telegraphing1 in ancient and modern times1 have been sound and sight4 ,anything that can be expressed so as to be read at a distance1 and that conveys a meaning1 is a telegram4 ,footnote3 ,this word is of ,american coinage1 and first appeared in the ,albany ,evening ,journal1 in #aheb4 ,it avoids the use of two words1 as ,telegraphic ,message1 or ,telegraphic ,dispatch1 and the ungrammatical use of ,telegraph1 for a message by telegraph4 ,the new word was at once adopted4 ,our plains ,indians used columns of smoke1 or fires1 and are the actual inventors of the heliograph1 now so called1 though formerly meaning the making of a picture by the aid of the sun--photography4 ,the vessels of a squadron at sea have long used telegraphic signals4 ,some of the celebrated sentences of our history have been written by visual signals1 such as ,hold the fort1 for ,i am coming1 ,don't give up the ship1 etc4 ,order of showing1 positions1 and colors are arbitrarily made to mean certain words4 ,the sinking of the ,victoria in #ahic1 was brought about by the orders conveyed by marine signals4 ,bells and guns signal by sound4 ,so does the modern electric telegraph1 contrary to original design4 ,it is all telegraphy1 but it all required an agreed and very limited code1 and comparative nearness4 ,none of the means in ancient use were available for the multifarious uses of modern commerce4 ,as soon as it was known that electricity could be sent long distances over wires1 human genius began to contrive a way of using it as a means of conveying definite intelligence4 ,the first idea of the kind was attempted to be put into effect in #aggd4 ,this was1 however1 before the discovery of the electro-magnet 7about #ahjj71 or even the ,galvanic battery1 and it was seriously proposed to have as many wires as there were letters2 each wire to have a frictional battery for generating electricity at one end of the circuit1 and a pith-ball electroscope at the other4 ,the modern reader may smile at the idea of the hurried sender of a message taking a piece of cat-skin1 or his silk handkerchief1 and rubbing up the successive letter-balls of glass or sulphur until he had spelled out his telegram4 ,later a man named ,dyer1 of ,new ,york1 invented a system of sending messages by a single wire1 and of causing a record to be made at the receiving office by means of a point passing over litmus paper1 which the current was to mark by chemical action1 the paper passing over a roller or drum during the operation4 ,the battery for this arrangement was also frictional4 ,they knew of no other4 ,then came the deflected-needle telegraph1 first suggested by ,ampre1 and a few such lines were constructed1 and to some extent operated4 ,in one of the original telegraph lines the wires were bound in hemp and laid in pipes on the surface of the ground4 ,the expedient of poles and atmospheric insulation was not thought of until it was adopted as a last resort during the construction of ,morse's first line between ,washington and ,baltimore4 ,in the year #ahcb1 an ,american named ,samuel ,f4 ,b4 ,morse was making a voyage home from ,havre to ,new ,york in the sailing packet ,sully4 ,he was an educated man1 a graduate of ,yale1 and an artist1 being the holder of a gold medal awarded him for his first work in sculpture1 and no want of success drove him to other fields4 ,but during this tedious voyage of the old times in a sailing vessel he seems to have conceived the idea which thenceforth occupied his life4 ,it was the beginning of the present ,electric ,telegraph4 ,during this same voyage he embodied his notions in some drawings1 and they were the beginnings of vicissitudes among the most long-continued and trying for which life affords any opportunity4 ,he abandoned his studies4 ,he paid attention to no other interest4 ,he passed years in silent and lonesome endeavors that seemed to all others useless4 ,he subjected himself to the reproaches of all his friends1 lost the confidence of business men1 gained the reputation of being a monomaniac1 and was finally given over to the following of devices deemed the most useless and unpromising that up to that time had occupied the mind of any man4 ,the rank and file of humanity had no definite idea of the plan1 or of the results that would follow if it were successful4 ,in reality no one cared4 ,it was ,morse's enterprise exclusively--a crank's fad alone4 ,there has been no period in the history of society when the public1 as a body1 was interested in any great change in the systems to which it was accustomed4 ,there is always enmity against an improver4 ,in reality1 the question of how much money ,morse should make by inventing the electric telegraph was the question of least importance4 ,yet it was regarded as the only one4 ,he is dead4 ,his profits have gone into the mass1 his honors have become international4 ,the patents have long expired4 ,the public1 the entire world1 are long since the beneficiaries1 and the benefits continue to be inconceivably vast4 ,nothing in all history exceeds in moral importance the invention of the telegraph except the invention of printing with movable types4 ,illustration3 ,,an ,,electro-,,magnet ,,of ,,morse',s ,,time4 ,after eight years of waiting1 and the repeated instruction of the entire ,congress of the ,united ,states in the art of telegraphy1 that body was finally induced to make an appropriation of thirty thousand dollars to be expended in the construction of an experimental line between ,washington and ,baltimore4 ,and now begins the actual strangeness of the story of the ,telegraph4 ,after many years of toil1 ,morse still had learned nothing of the efficient construction of an electro-magnet4 ,the magnet which he attempted to use unchanged was after the pattern of the first one ever made--a bent ,u-shaped bar1 around which were a few turns of wire not insulated4 ,the bar was varnished for insulation1 and the turns of wire were so few that they did not touch each other4 ,the apparatus would not work at a distance of more than a few feet1 and not invariably then4 ,professor ,leonard ,d4 ,gale suggested the cause of the difficulty as being in the sparseness of the coils of wire on the magnet and the use of a single-cell battery4 ,he furnished an electro-magnet and battery out of his own belongings1 with which the efficiency of the contrivance was greatly increased4 ,the only insulated wire then known was bonnet-wire1 used by milliners for shaping the immense flaring bonnets worn by our grandmothers1 and when it finally came to constructing the instruments of the first telegraphic system the entire stock of ,new ,york was exhausted4 ,the immense stocks of electrical supplies now available for all purposes was then1 and for many years afterwards1 unknown4 ,previous to the investigations of ,professor ,henry1 in #ahcj1 only the theory of causing a core of soft iron to become a magnet was known1 and the actual magnet1 as we make it1 had not been made4 ,morse1 in his beginnings1 had not money enough to employ a competent mechanic1 and was himself possessed of but scant mechanical skill or knowledge of mechanical results4 ,persistency was the quality by which he succeeded4 ,illustration3 ,,diagram ,,of ,,morse',s ,,instrument1 #ahcj1 ,,with ,,its ,,writing4 ,the battery used first by ,morse1 as stated1 was a single cell4 ,the one made later by his partner1 ,alfred ,vail1 the real author of all the workable features of the ,morse telegraph1 and of every feature which identifies it with the telegraph of the present1 was a rectangular wooden box divided into eight compartments1 and coated inside with beeswax so that it might resist the action of acids4 ,the telegraphic instrument as made by ,morse was a rectangular frame of wood1 now in the cabinet of the ,western ,union ,telegraph ,company1 at ,new ,york1 which was intended to be clamped to the edge of a table when in use4 ,he knew nothing of the splendid invention since known as the ,morse ,alphabet1 and the spelling of words in a telegram was not intended by him4 ,his complicated system1 as described in his caveat filed by him in #ahcg1 consisted in a system of signs1 by which numbers1 and consequently words and sentences1 were to be indicated4 ,there was then a set of type arranged to regulate and communicate the signs1 and rules in which to set this type4 ,there was a means for regulating the movement forward of the rule containing the types4 ,this was a crank to be turned by the hand4 ,the marking or writing apparatus at the receiving instrument was a pendulum arranged to be swung across the slip of paper1 as it was unwound from the drum1 making a zig-zag mark the points of which were to be counted1 a certain number of points meaning a certain numeral1 which numeral meant a word4 ,a separate type was used to represent each numeral1 having a corresponding number of projections or teeth4 ,a telegraphic dictionary was necessary1 and one was at great pains prepared by ,morse4 ,his process was1 therefore1 to translate the message to be sent into the numerals corresponding to the words used1 to set the types corresponding to those numerals in the rule1 and then to pass the rule through the appliance arranged for the purpose in connection with the electric current4 ,the receiver must then translate the message by reference to the telegraphic dictionary1 and write out the words for the person to whom the message was sent4 ,this was all changed by ,vail1 who invented the dot-and-dash alphabet1 and modified the mechanical action of the instrument necessary for its use4 ,the arrangement of a steel embossing-point working upon a grooved roller--a radical difference--was a portion of this change4 ,the invention of the axial magnet1 also ,vail's1 was another4 ,morse had regarded a mechanical arrangement for transmitting signals as necessary4 ,vail1 in the practice of the first line1 grew accustomed to sending messages by dipping the end of the wire in the mercury cup1--the beginning of the present transmitting instrument1 which is also his invention--and ,morse's port-rule1 types1 and other complicated arrangements1 went into the scrap-heap4 ,illustration3 ,,modern ,,transmitter4 ,yet there were some strange things still left4 ,the receiving relay weighed #ahe pounds4 ,an equally efficient modern one need not weigh more than half a pound4 ,morse had intended to make a recording telegraph distinctively2 it was to his mind its chiefest value4 ,almost in the beginning it ceased to be such1 and the recording portion of the instrument has for many years been unknown in a telegraph office1 being replaced by the sounder4 ,this was also the invention of ,vail4 ,the more expert of the operators of the first line discovered that it was possible to read the signals by the sound made by the armature lever4 ,in vain did the managers prohibit it as unauthorized4 ,the practice was still carried on wherever it could be without detection4 ,morse was uncompromising in his opposition to the innovation4 ,the wonderful alphabet of the telegraph1 the most valuable of the separate inventions that make up the system1 was not his conception4 ,the invention of this alphabetical code1 based on the elements of time and space1 has never met with the appreciation it has deserved4 ,it has been found applicable everywhere4 ,flashes of light1 the raising and lowering of a flag1 the tapping of a finger1 the long and short blasts of a steam whistle1 spell out the words of the ,english language as readily as does the sounder in a telegraph-office4 ,it may be interpreted by sight1 touch1 taste1 hearing4 ,with a wire1 a battery and ,vail's alphabet1 telegraphy is entirely possible without any other appliances4 ,illustration3 ,,modern ,,sounder4 ,a brief sketch of the difficulties attending the making of the first practical telegraph line will be interesting as showing how much and how little men knew of practical electricity in #ahdc4 ,footnote3 ,there was no possibility of their knowing more1 notwithstanding that1 viewed from the present1 their inexperienced struggles seem almost pathetic4 ,so1 also1 do the ideas of ,galvani and the experiments and conclusions of all except ,franklin1 until we come to ,faraday4 ,it is one of the features of the time in which we live that1 regardless of age1 we are all scholars of a new school in which mere diligence and behavior are not rewarded1 and in which it is somewhat imperative that we should keep up with our class in an understanding of what are now the facts of daily life1 wonders though they were in the days of our youth4 ,to begin with1 it was a metallic circuit2 that is1 two wires were to be used instead of one wire and a ground connection4 ,they knew nothing of this last4 ,vail discovered and used it before the line was finished4 ,the two wires1 insulated1 were inclosed in a pipe1 lead presumably1 and the pipe was placed in the ground4 ,ezra ,cornell1 afterwards the founder of ,cornell ,university1 had been engaged in the manufacture and sale of a patent plow1 and undertook to make a pipe-laying machine for this new telegraph line4 ,after the work had been begun ,vail tested and united the conductors as each section was laid4 ,when ten miles were laid the insulation1 which had been growing weaker1 failed altogether4 ,there was no current4 ,probably every schoolboy now knows what the trouble was4 ,the earth had stolen the current and absorbed it4 ,the modern boy would simply remark ,induction1 and turn his attention to some efficient remedy4 ,then1 there was consternation4 ,cornell dexterously managed to break the pipe-laying machine1 so as to furnish a plausible excuse to the newspapers and such public as there may be said to have been before there was any telegraph line4 ,days were spent in consultation at the ,relay ,house1 and in finding the cause of the difficulty and the remedy4 ,of the congressional appropriation nearly all had been spent4 ,the interested parties even quarreled1 as mere men will under such circumstances1 and the want of a little knowledge which is now elementary about electricity came near wrecking forever an enterprise whose vast importance could not be1 and was not then1 even approximately measured4 ,illustration3 ,,alfred ,,vail4 ,finally1 after some weeks delay1 it was decided to introduce what has become the most familiar feature of the landscape of civilization1 and string the wires on poles4 ,there is little need to follow the enterprise further4 ,morse stayed with one instrument in the ,capitol at ,washington1 and ,vail carried another with him at the end of the line4 ,already the type-and-rule and all the symbols and dictionaries had been discarded1 and the dot-and-dash alphabet was substituted4 ,on ,april #bc;d1 #ahdd1 ,vail substituted the earth for the metallic circuit as an experiment1 and that great step both in knowledge and in practice was taken4 ,within an incredibly brief space the ,morse ,electric ,telegraph had spread all over the world4 ,no man's triumph was ever more complete4 ,he passed to those riches and honors that must have been to him almost as a fulfilled dream4 ,in ,europe his progresses were like those of a monarch4 ,he was made a member of almost all of the learned societies of the world1 and on his breast glittered the medals and orders that are the insignia of human greatness4 ,a congress of representatives of ten of the governments of ,europe met in ,paris in #aheh1 and it was unanimously decided that the sum of four hundred thousand francs--about a hundred thousand dollars--should be presented to him4 ,he died in ,new ,york in #ahgb4 ,illustration3 ,,prof4 ,,henry',s ,,electromagnet ,,and ,,armature ,yet not a single feature of the invention of ,morse1 as formulated in his caveat and described in his original patent1 is to be found among the essentials of modern telegraphy4 ,they had mostly been abandoned before the first line had been completed1 and the arrangements of his associate1 ,vail1 were substituted4 ,professor ,joseph ,henry had1 in #ahcb1 constructed an electromagnetic telegraph whose signals were made by sound1 as all signals now are in the so-called ,morse system4 ,he hung a bar-magnet on a pivot in its center as a compass-needle is hung4 ,he wound a ,u-shaped piece of soft iron with insulated wire1 and made it an electro-magnet1 and placed the north end of the magnetized bar between the two legs of this electro-magnet4 ,when the latter was made a magnet by the current the end of the bar thus placed was attracted by one leg of the magnet and repelled by the other1 and was thus caused to swing in a horizontal plane so that the opposite end of it struck a bell4 ,thus was an electric telegraph made as an experimental toy1 and fulfilling all the conditions of such an one giving the signals by sound1 as the modern telegraph does4 ,it lacked one thing--the essential4 ,footnote3 ,the details of the construction of the modern telegraph line are not here stated4 ,there are none that change1 in principle1 the outline above given4 ,the ,vail telegraphic alphabet had not been thought of4 ,had such an idea been conceived previously a message could have been read as it is read now1 and with the toy of ,professor ,henry which he abandoned without an idea of its utility or of the possibilities of any telegraph as we have long known them4 ,morse knew these possibilities4 ,he was one of the innumerable eccentrics who have been right1 one of the prophets who have been in the beginning without honor1 not only in respect to their own country1 but in respect to their times4 ,illustration3 ,,diagram ,,of ,,telegraph ,,system4 ,,chapter ,,ii4 ,,the ,,ocean ,,cable4--,the remaining department of ,telegraphy is embodied in the startling departure from ancient ideas of the possible which we know as cable telegraphy1 the messages by such means being cablegrams4 ,about these ocean systems there are many features not applying to lines on land1 though they are intended to perform the same functions in the same way1 with the same object of conveying intelligence in language1 instantly and certainly1 but under the sea4 ,the marine cables are not simple wires4 ,there is in the center a strand of usually seven small copper wires1 intended as the conductor of the current4 ,these1 twisted loosely into a small cable1 are surrounded by repeated layers of gutta-percha1 which is1 in turn1 covered with jute4 ,outside of all there is an armor of wires1 and the entire cable appears much like any other of the wire cables now in common use with elevators1 bridges1 and for many purposes4 ,in the shallow waters of bays and harbors1 where anchors drag and the like occurrences take place1 the armor of a submarine cable is sometimes so heavy as to weigh more than twenty tons to the mile4 ,there are peculiar difficulties encountered in sending messages by an ocean cable1 and some of these grow out of the same induction whose laws are indispensable in other cases4 ,the inner copper core sets up induction in the strands of the outer armor1 and that again with the surrounding water4 ,there is1 again1 a species of re-induction affecting the core1 so that faint impulses may be received at the terminals that were never sent by the operators4 ,all of these difficulties combined result in what electricians term retardation4 ,it is one of the departments of telegraphy that1 like the unavoidable difficulties in all machines and devices1 educates men to their special care1 and keeps them thinking4 ,it is one of the natural features of all the mechanical sciences that results in the continual making of improvements4 ,the first impression in regard to ocean cables would be that very strong currents are used in sending impulses so far4 ,the opposite is true4 ,the receiving instrument is not the noisy sounder of the land lines4 ,there was1 until recently1 a delicate needle which swung to and fro with the impulses1 and reflected beams of light which1 according to their number and the space between them spelled out the message according to the ,vail dot-and-dash alphabet4 ,now1 however1 a means still more delicate has been devised1 resulting in a faint wavy ink-line on a long1 unwinding slip of paper1 made by a fountain pen4 ,this strange manuscript may be regarded as the latest system of writing in the world1 having no relationship to the art of ,cadmus1 and requiring an expert and a special education to decipher it4 ,those faint pulsations1 from a hand three thousand miles away across the sea1 are the realization of a magic incredible4 ,the necromancy and black art of all antiquity are childish by comparison4 ,they give but faint indications of what they often are--the messages of love and death2 the dictations of statesmanship2 the heralds of peace or war2 the orders for the disposition of millions of dollars4 ,the story of the laying of the first ocean cable is worthy of the telling in any language1 but should be especially interesting to the ,american boy and girl4 ,it is a story of native enterprise and persistence2 perhaps the most remarkable of them all4 ,the earliest ocean telegraph was that laid by two men named ,brett1 across the ,english ,channel4 ,for this cable1 a pioneer though crossing only a narrow water1 the conservative officials of the ,british government refused a charter4 ,in ,august1 #ahej1 they laid a single copper wire covered with gutta-percha from ,dover in ,england to the coast of ,france4 ,the first wire was soon broken1 and a second was made consisting of several strands1 and this last was soon imitated in various short reaches of water in ,europe4 ,but the ,atlantic had always been considered unfathomable4 ,no line had ever sounded its depths1 and its strong currents had invariably swept away the heaviest weights before they reached its bed4 ,its great feature1 so far as known1 was that strange ocean river first noted and described by ,franklin1 and known to us as the ,gulf ,stream4 ,in #ahec a circumstance occurred which again turned the attention of a few men to the question of an ,atlantic cable4 ,lieutenant ,berryman1 of the ,navy1 made a survey of the bottom of the ,atlantic from ,newfoundland to ,ireland1 and the wonderful discovery was made that the floor of the ocean was a vast plain1 not more than two miles below the surface1 extending from one continent to the other4 ,this plain is about four hundred miles wide and sixteen hundred long1 and there are no currents to disturb the mass of broken shells and unknown fishes that lie on its oozy surface4 ,it was named the ,telegraphic ,plateau1 with a view to its future use4 ,at either edge of this plateau huge mountains1 from four to seven thousand feet high1 rise out of the depths4 ,there are precipices of sheer descent down which the cable now hangs4 ,the ,azores and ,bermudas are peaks of ocean mountains4 ,the warm river known as the ,gulf ,stream1 coming northward meets the ice-bergs and melts them1 and deposits the shells1 rocks and sand they carry on this plain4 ,when it was discovered the difficulty in the way of an ,atlantic cable seemed no longer to exist1 and those who had been anxious to engage in the enterprise began to bestir themselves4 ,of these the most active was the ,american1 ,cyrus ,w4 ,field4 ,he began life as a clerk in ,new ,york ,city4 ,when thirty-five years old he became engaged in the building of a land line of telegraph across ,newfoundland1 the purpose of which was to transmit news brought by a fast line of steamers intended to be established1 and the idea is said to have occurred to him of making a line not only so far1 but across the sea4 ,in ,november1 #ahef1 he had succeeded in forming a company1 and the entire capital1 amounting to #cej1jjj pounds1 was subscribed4 ,the governments of ,england and the ,united ,states promised a subsidy to the stockholders4 ,the cable was made in ,england4 ,the ,niagara was assigned by the ,united ,states1 and the ,agamemnon by ,england1 each attended by smaller vessels1 to lay the cable4 ,in ,august1 #aheg1 the ,niagara left the coast of ,ireland1 dropping her cable into the sea4 ,even when it dropped suddenly down the steep escarpment to the great plateau the current still flowed4 ,but through the carelessness of an assistant the cable parted4 ,that was the beginning of mishaps4 ,the task was not to be so easily done1 and the enterprise was postponed until the following year4 ,that next year was still more memorable for triumph and disappointment4 ,it was now designed that the two vessels should meet in mid-ocean1 unite the ends of the cable1 and sail slowly to opposite shores4 ,there were fearful storms4 ,the huge ,agamemnon1 overloaded with her half of the cable1 was almost lost4 ,but finally the spot in the waste and middle of the ,atlantic was reached1 the sea was still1 and the vessels steamed away from each other slowly uncoiling into the sea their two halves of the second cable4 ,it parted again1 and the two ships returned to ,ireland4 ,in ,july they again met in mid-ocean4 ,europe and ,america were both charitably deriding the splendid enterprise4 ,all faith was lost4 ,it was known1 to journalism especially1 that the cable would never be laid and that the enterprise was absurd4 ,but it was like the laying of the first land line4 ,there was a way to do it1 existing in the brains and faith of men1 though at first that way was not known4 ,from this third meeting the two ships again sailed away1 the ,niagara for ,america1 the ,agamemnon for ,valencia ,bay4 ,this time the wire did not part1 and on ,august #bith1 #aheh1 the old world and the new were bound together for the first time1 and each could read almost the thoughts of the other4 ,the queen saluted ,america1 and the president replied4 ,there were salutes of cannon and the ringing of bells4 ,but the messages by the cable grew indistinct day by day1 and finally ceased4 ,the ,atlantic cable had been laid1 and--had failed4 ,eight years followed1 and the cable lay forgotten at the bottom of the sea4 ,the reign of peace on earth and good will to men had so far failed to come and they were years of tumult and bitterness4 ,the ,union of the ,united ,states was called upon to defend its integrity in a great war4 ,a bitter enmity grew up between us and ,england4 ,the telegraph1 and all its persevering projectors1 were almost absolutely forgotten4 ,electricians declared the project utterly impracticable1 and it began1 finally1 to be denied that any messages had ever crossed the ,atlantic at all1 and ,field and his associates were discredited4 ,it was said that the current could not be made to pass through so long a circuit4 ,new routes were spoken of--across ,bering's ,strait1 and overland by way of ,siberia--and measures began to be taken to carry this scheme into effect4 ,amid these discouragements1 ,field and his associates revived their company1 made a new cable1 and provided everything that science could then suggest to aid final success4 ,this new cable was more perfect than any of the former ones1 and there was a mammoth side-wheel steamer known as the ,great ,eastern1 unavailable as it proved for the ordinary uses of commerce1 and this vessel was large enough to carry the entire cable in her hold4 ,in ,july1 #ahfe1 the huge steamer left ,ireland1 dropping the endless coil into the sea4 ,the same men were engaged in this last attempt that had failed in all the previous ones4 ,it is one of the most memorable instances of perseverance on record4 ,but on ,august #fth a flaw occurred1 and the cable was being drawn up for repairs4 ,the sound of the wheel suddenly stopped2 the cable broke and sunk into the depths4 ,the ,great ,eastern returned unsuccessful to her port4 ,field was present on board on this occasion1 and had been present on several similar ones4 ,there was1 so far as known1 no record made by him of his thoughts4 ,there were now five cables in the bed of the ,atlantic1 and each one had carried down with it a large sum of money1 and a still larger sum of hopes4 ,yet the ,great ,eastern sailed again in ,july1 #ahff1 her tanks filled with new cable and ,field once more on her decks4 ,it was the last1 and the successful attempt4 ,the cable sank steadily and noiselessly into the sea1 and on ,july #bfth the steamer sailed into ,trinity ,bay4 ,the connection was made at ,heart's ,content1 a little ,new ,foundland fishing village1 and one for this occasion admirably named4 ,then the lost cable of #ahfe was found1 raised and spliced4 ,in these later times1 if a flaw should occur1 science would locate it1 and go and repair it4 ,even if this were not true1 the fact remains that this last cable1 and that of #ahfe1 have been carrying their messages under the sea for nearly thirty years4 ,the lesson is that repeated failures do not mean final failure4 ,there is often said to be a malice1 a spirit of rebellion1 in inanimate things4 ,they refuse to become slaves until they are once and for all utterly subdued1 and then they are docile forever4 ,yet the malice truly lies in the inaptitude and inexperience of men4 ,had ,field and his associates known how to make and lay an ,atlantic cable in the beginning as well as they did in the end1 the first one laid would have been successful4 ,the years were passed in the invention of machinery for laying1 and in improving the construction of each successive cable4 ,many have been laid since then1 certainly and without failure4 ,men have learned how4 ,footnote3 ,at present the total mileage of submarine cables is about #aeb1jjj miles1 costing altogether #bjj1jjj1jjj4 ,the length of land wires throughout the world is over #b1jjj1jjj miles1 costing #bbe1jjj1jjj4 ,the capital invested in all lines1 land and sea1 is about #ecj1jjj1jjj4 ,thirteen years were passed in this succession of toils1 expenditures1 trials and failures4 ,field crossed the ,atlantic more than fifty times in these years1 in pursuit of his great idea4 ,at last1 like ,morse1 he was crowned with wealth1 success1 medals and honors4 ,he was acquainted with all the difficulties4 ,it is now known that he knew through them all that an ocean cable could finally be laid4 ,,the ,,telephone4--,the telegraph had become old4 ,all nations had become accustomed to its use4 ,more than thirty years had elapsed--a long time in the last half of the nineteenth century--before mankind awoke to a new and startling surprise2 the telegraph had been made to transmit not only language1 but the human voice in articulate speech4 ,footnote3 ,it has been noted that ,morse's idea was a recording telegraph1 that being in his mind its most valuable point1 and that this idea has long been obsolete4 ,in like manner1 when the ,telephone was invented there was a general business opinion that it was perhaps an instrument useful in colleges for demonstrating the wonders of electricity1 but not useful for commercial purposes because it made no record4 ,business will always be done in black and white was the oracular verdict of prominent and experienced business men4 ,it may be true1 but a little conversation across space has been found indispensable4 ,the telephone is a remarkable business success4 ,the fact first became known in #ahgc1 and was the invention of ,alexander ,g4 ,bell1 of ,chicago4 ,illustration3 ,,diagram ,,of ,,telephone4--,,the ,,blake ,,transmitter4 ,there were several1 no one knows how many1 attempts to accomplish this remarkable feat previous to the success of ,professor ,bell4 ,one of these was by ,reis1 of ,frankfort1 in #ahfj4 ,it did not embrace any of the most valuable principles involved in what we know as the telephone1 since it could not transmit speech4 ,professor ,bell's first operative apparatus was accompanied by simultaneous inventions by ,gray1 ,edison1 and others4 ,this remarkable instance of several of the great electricians of the country evolving at nearly the same time the same principal details of a revolutionary invention1 has never been fully explained4 ,the first rather crude and ineffective arrangements were rapidly improved by these men1 and by others1 prominent among whom is ,blake1 whose remarkable transmitter will be described presently4 ,the best devices of these inventors were finally embodied1 and in the resulting instrument we have one of the chiefest of those modern wonders whose first appearance taxed the credulity of mankind4 ,footnote3 ,there were1 until a recent period1 a line of statements1 alleged facts and reasonings1 that were incredible in proportion to intelligence4 ,the occurrences of recent times have reversed this rule with regard to all things in the domain of applied science4 ,it is the ignorant and narrow only who are incredulous1 and the ears of intelligence are open to every sound4 ,all that is not absurd is possible1 and all that is possible is sure to be accomplished4 ,the telephone1 as a statement1 was absurd1 but not to the men who worked for its accomplishment and finally succeeded4 ,the lines grow narrow4 ,it requires now a high intelligence to decide even upon the fact of absurdity within the domain of natural law4 ,in reality the telephone is simple in construction4 ,workmen who are not accomplished electricians constantly erect1 correct and repair the lines and instruments4 ,the machine is not liable to derangement4 ,any person may use it the first time of trying1 and this use is almost universal4 ,yet it is1 from the view of any hour in all the past1 an incomprehensible mystery4 ,a moment of reflection drifts the mind backward and renders it almost incredible in the present4 ,the human voice1 recognizable1 in articulate words1 is apparently borne for miles1 now even for some hundreds of miles1 upon an attenuated wire which hangs silent in the air carrying absolutely nothing more than thousands of little varying impulses of electricity4 ,not a word that is spoken at one end of it is ever heard at the other1 and the conclusion inevitable to the reason of even twenty years ago would be that if one person does not actually hear the other talk there is a miracle4 ,probably this idea that the voice is actually carried is not very uncommon4 ,the facts seem incomprehensible otherwise1 and it is not considered that if that idea were correct it would be a miracle4 ,the entire explanation of the magic of the telephone lies in electrical induction4 ,to the brief explanation of that phenomenon previously given the reader is again referred for a better understanding of what now follows4 ,but1 first1 a moment's consideration may be given to the results produced by the use of this appliance1 which1 as an illustration of the way of the world was an innovation that1 had it remained uninvented or impossible1 would never have been even desired4 ,one third more business is said now to be transacted in the average day than was possible previously4 ,since many things can now go on together which previously waited for direction1 authority and personal arrangement1 a man's business life is lengthened one-third1 while his business may mostly be done1 to his great convenience1 from one place4 ,it has given employment to a large number of persons1 a large proportion of whom are young women4 ,the status of woman in the business world has been1 fortunately or unfortunately1 by so much changed4 ,it has introduced a new necessity1 never again to be dispensed with4 ,it has changed the ancient habits1 and with them1 unconsciously1 the habit of thought4 ,contact not personal between man and man has increased4 ,the thought of others is quickly arrived at4 ,it has caused us to become more appreciative of the absolute meanings and values of words1 without assistance from face1 manner or gesture4 ,laughter may be heard1 but tears are unseen4 ,it has induced caution in speech and enforces brevity4 ,while none of its conveniences are now noted1 and all that it gives is expected1 the telephone1 with all its effects1 has entered--into the sum of life4 ,on the wall or table there is a box1 and beside this box projects a metal arm4 ,in a fork of this arm hangs a round1 black1 trumpet-shaped1 hard rubber tube4 ,this last is the receiving instrument4 ,it is taken from its arm and held close to the ear4 ,the answers are heard in it as though the person speaking were there concealed in an impish embodiment of himself4 ,meantime the talking is done into a hole in the side of the box1 while the receiver is held to the ear4 ,this is all that appears superficially4 ,an operation incredible has its entire machinery concealed in these simplicities4 ,it is difficult to explain the mystery of the telephone in words--though it has been said to be simple--and it is almost impossible unless the reader comprehends1 or will now undertake to comprehend1 what has been previously said on the subject of the production of magnetism by a current of electricity1 as in the case of the electro-magnet1 and on the subject of induction and its laws4 ,it has been shown that electricity produces magnetism2 that the current1 properly managed as described1 creates instantly a powerful magnet out of a piece of soft iron1 and leaves it again a mere piece of iron at the will of the operator4 ,this process also will work backwards4 ,an electric current produces a magnet1 and a magnet also may be made to produce an electric current4 ,it is one more of the innumerable1 almost universal1 cases where scientific and mechanical processes may be reversed4 ,when the dynamo is examined this process is still further exemplified1 and when we examine the dynamo and the motor together we have a striking example of the two processes going on together4 ,the application of this making of a current1 or changing its intensity1 in the telephone1 is apparently totally unlike the continuous manufacture of the induced current for daily use by means of the steam engine and dynamo4 ,but it is in exact accord with the same laws4 ,it will1 perhaps1 be more readily understood by recalling the results of the experiment of the two wires1 where it was found that an approach to1 or a receding from1 a wire carrying a current1 produces an impulse over the wire that has by itself no current at all4 ,now1 it must be added to that explanation that if the battery were detached from that conducting wire1 and if1 instead of its being a wire for the carrying of a battery current it were itself a permanent magnet1 the same results would happen in the other wire if it were rapidly moved toward and away from this permanent magnet4 ,if the reader should stretch a wire tightly between two pegs on a table1 and should then hold the arms of a common horseshoe magnet very near it1 and should twang the stretched wire with his finger1 as he would a guitar string1 the electrometer would show an induced alternate current in the wire4 ,since this is an illustration of the principle of the dynamo1 stated in its simplest form1 it may be well to remember that in this manner--with the means multiplied and in all respects made the most of--a very strong current of electricity may be evolved without any battery or other source of electricity except a magnet4 ,in connection with this substitution of a magnet for a current-carrying wire1 it must be remembered that moving the magnet toward or from the wire has the same result as moving the wire instead4 ,it does not matter which piece is moved4 ,in addition to the above1 it should be stated that not only will an induced current be set up in the wire1 but also the magnetism in the magnet will be increased or diminished as the tremblings of the wire cause it to approach or recede from it4 ,therefore if a wire be led away from each pole of a permanent magnet1 and the ends united to form a circuit1 an induced current will appear in this wire if a piece of soft iron is passed quickly near the magnet4 ,there is an essential part of the telephone that it is necessary to go outside of the field of electricity to describe4 ,it is undoubtedly understood by the reader that all sound is produced by vibrations1 or rapid undulations1 of the surrounding air4 ,if a membrane of any kind is stretched across a hoop1 and one talks against it1 so to speak1 the diaphragm or membrane will be shaken1 will vibrate1 with the movement of the air produced by the voice4 ,if a cannon be fired all the windows rattle1 and are often broken4 ,a peal of thunder will cause the same jar and rattle of window panes1 manifestly by what we call sound--vibrations of the air4 ,the window frame is a diaphragm4 ,the ear is constructed on the same principle1 its diaphragm being actually moved by the vibrations of air1 being what we call hearing4 ,with these facts about sound understood in connection with those given in connection with the substitution of a magnet for a battery current1 it is entirely possible for any non-expert to understand the theory of the construction of the telephone4 ,in the ,bell telephone1 now used with the ,blake transmitter which differs somewhat from the arrangement ,i shall now describe a bar magnet has a portion of its length wound with very fine insulated wire4 ,across the opposite end of this polarized ,footnote3 ,polarized means magnetized2 having the two poles of a permanent magnet4 ,the term is frequently used in descriptions of electrical appliances4 ,instead of using the terms positive and negative1 it is also customary to speak of the ,north or the ,south of a magnet1 battery or circuit4 magnet1 crosswise to it1 and very close1 there is placed a diaphragm of thin sheet iron4 ,this is held only around its edge1 and its center is free to vibrate toward and from the end of this polarized magnet4 ,this thin disc of iron1 therefore1 follows the movements1 the soundwaves1 of the air against it1 which are caused by the human voice4 ,we have an instance of apiece of soft iron moving toward1 and away from1 a magnet4 ,it moves with a rapidity and violence precisely proportioned to the tones and inflections of the voice4 ,those movements are almost microscopic1 not perceptible to the eye1 but sufficient4 ,the approaching and receding have made a difference1 in the quality of the magnet4 ,its magnetism has been increased and diminished1 and the little coil of insulated wire around it has felt these changes1 and carried them as impulses over the circuit of which it is a part4 ,in that circuit1 at the other end1 there is a precisely similar little insulated coil1 upon a precisely similar polarized magnet4 ,these impulses pass through this second coil1 and increase or diminish the magnetism in the magnet round which it is coiled4 ,that1 in turn1 affects by magnetic attraction the diaphragm that is arranged in relation to its magnet precisely as described for the first4 ,the first being controlled as to the extent and rapidity of its movements by the loudness and other modifications of the voice1 the impulses sent over the circuit vary accordingly4 ,as a consequence1 so does the strength of the magnet whose coil is also in the circuit4 ,so1 therefore1 does its power of attraction over its diaphragm vary4 ,the result is that the movements that are caused in the first diaphragm by the voice1 are caused in the second by an attraction that varies in strength in proportion to the vibrations of the voice speaking against the first diaphragm4 ,this is the theory of the telephone4 ,the sounds are not carried1 but mechanically produced again by the rattle of a thin piece of iron close to the listener's ear4 ,the voice is full1 audible1 distinct1 as we hear it naturally1 and as it impinges upon the transmitting diaphragm4 ,in reproduction at the receiving instrument it is small in volume2 almost microscopic1 if the phrase may be applied to sound4 ,we hear it only by placing the ear close to the diaphragm4 ,it will be seen that this is necessarily so4 ,no attempts to remedy the difficulty have so far been successful4 ,there is no means of reproducing the volume of the voice with the minute vibrations of a little iron disc4 ,in actual service an electro-magnet is used instead of1 or in addition to1 the bar magnets described above4 ,a steady flow from a battery is passed through an instrument which throws this current into proper vibrations by stopping the flow of the current at each interval between impulses4 ,there is a piece of carbon between the diaphragm and its support4 ,the wires are connected with the diaphragm and its support1 and the current passes through the carbon4 ,when the diaphragm vibrates1 the carbon is slightly compressed by it4 ,pressure reduces its resistance1 and a greater current passes through it and over the wires of the circuit for the instant during which the touch remains4 ,this is the ,blake transmitter4 ,it should be explained that carbon stands low on the list of conductors of electricity4 ,the more dense it is1 the better conductor4 ,the varying pressures of the diaphragm serve to produce this varying density and the consequent varying impulses of the current which effect the receiving diaphragm4 ,the transmitter1 as above described1 is in the square box1 and its round black diaphragm may be seen behind the round hole into which one talks4 ,footnote3 ,shouting into a telephone doubtless comes of the idea1 unconscious1 that one is speaking to a person at a distance4 ,to speak distinctly is better1 and in an ordinary tone4 ,the receiver is the trumpet-shaped tube which hangs on its side1 and is taken from its hook to be used4 ,the call-bell has nothing to do with the telephone4 ,it is operated by a small magneto-generator1--a very near relative of the dynamo-the current from which is sent over the telephone circuit 7the same wires7 when the small crank is turned4 ,sometimes the question occurs3 ,why ring one's own bell when one desires to ring only that at the central office8 ,the answer is that both bells are in the same circuit4 ,if the circuit is uninterrupted your bell will ring when you ring the other1 and a bell at each end of your circuit is necessary in any case1 else you could not yourself be called4 ,when the receiving instrument is on its hook its weight depresses the lever slightly4 ,this slight movement connects the bell circuit and disconnects the telephone circuit4 ,take it off the hook and the reverse is effected4 ,the long-distance telephone differs from the ordinary only in larger conductors1 improved instruments1 and a metallic circuit--two wires instead of the ordinary single wire and ground connections4 ,illustration3 ,,teleautograph ,,transmitting ,,instrument4 ,,the ,,telautograph4--,this1 the latest of modern miracles in the field of electricity1 comes naturally after the telegraph and telephone1 since it supplements them as a means of communication between individuals4 ,it also is the invention of ,prof4 ,elisha ,gray1 who seems to be as well the author of the name of his extraordinary achievement4 ,it is not the first instrument of the kind attempted4 ,the desire to find a means of writing at a distance is old4 ,bain1 of ,edinburgh1 made a machine partially successful fifty years ago4 ,like the telegraph as intended by ,morse1 there was the interposition of typesetting before a message could be sent4 ,it did not write1 or follow the hand of the operator in writing1 though it did reproduce at the other end of the circuit in facsimile the faces of the types that had been set by the sender4 ,it was a process by electrolysis1 well understood by all electricians4 ,several of this variety of writing telegraphs have been made1 some of them almost successful1 but all lacking the vital essential4 ,footnote3 ,the lack of one vital essential has been fatal to hundreds of inventions4 ,inventors unconsciously follow paths made by predecessors4 ,the entire class of transmitting instruments must dispense with tedious preliminaries1 and must use words4 ,vail accomplished this in telegraphy4 ,bell and others in the telephone1 and ,gray has borne the same fact in mind in the present development of the telautograph4 ,in #ahef ,casselli1 of ,florence1 made a writing telegraph which had a pendulum arrangement weighing fourteen pounds4 ,only one was ever made1 but it resulted in many new ideas all pertaining to the facsimile systems--the following of the faces of types--and all were finally abandoned4 ,the invention of ,gray is a departure4 ,the sender of a message sits down at a small desk and takes up a pencil1 writing with it on ordinary paper and in his usual manner4 ,a pen at the other end of the circuit follows every movement of his hand4 ,the result is an autograph letter a hundred miles or more away4 ,a man in ,chicago may write and sign a check payable in ,indianapolis4 ,personal directions may be given authoritatively and privately4 ,as in the case of the telephone1 no intervening operator is necessary4 ,no expertness is required4 ,even the use of the alphabet is not necessary4 ,a drawing of any description1 anything that can be traced with a pen or pencil1 is copied precisely by the pen at the receiving desk4 ,the possibilities of this instrument1 the uses it may develop1 are almost inconceivable4 ,it might be imagined that the lines drawn would be continuous4 ,on the contrary1 when the pen is lifted by the writer at the sending desk it also lifts itself from the paper at that of the receiver4 ,the action of the telautograph depends upon the variations in magnetic strength between two small electro-magnets4 ,it has been seen that an electro-magnet exerts its attractive force in proportion to the current which passes through its coil4 ,to use a phrase entirely non-technical1 it will pull hard or easy in proportion to the strength of the passing current4 ,this fact has been observed as the cause of action in the telephone1 where one diaphragm1 moved by the air-vibrations caused by the voice1 causes a varying current to pass over the wire1 attracting the other diaphragm less or more as the first is moved toward or away from its magnet4 ,in the telautograph the varying currents are caused not by the diaphragm influenced by the voice1 but by a pencil moved by the hand4 ,to show how these movements may be caused let us imagine a case that may occur in nature4 ,it is an interesting mechanical study4 ,there is an upright rush or reed growing in the middle of a running stream4 ,the stem of this rush has elasticity naturally2 it has a tendency to stand upright2 but it bends when there is a current against it4 ,it is easy enough to imagine it bending down stream more or less as the current is more or less strong4 ,imagine now another stream entering the first at right angles to it1 and that the rush stands in the center of both currents4 ,it will then bend to the force of the second stream also1 and the direction in which it will lean will be a compromise between the forces of the two4 ,lessen the flow of the current in one of the streams1 and the rush will bend a little less before that current and swing around to the side from which it receives less pressure4 ,cut off either of the currents entirely1 and it will bend in the direction of the other current only4 ,in a word1 if the quantity or strength of the current of both streams can be controlled at will1 the rush can be made to swing in any direction between the two1 and its tip will describe any figure desired1 aided1 of course1 by its own disposition to stand upright when there is no pressure4 ,let us imagine the rush to be a pen or pencil1 and the two streams of water to be two currents of electricity having power to sway and move this pencil in proportion to their relative strength1 as the streams did the rush4 ,imagine further that these two currents are varied and changed with reference to each other by the movements of a pen in a man's hand at another place4 ,it is an essential part of the mechanism of the telautograph1 and the movement is known among mechanicians as compounding a point4 ,gray1 while using the principles involved in compounding a point1 seems to have discarded the ways of transmitting magnetic impulses of varying strength commonly in use4 ,his method he calls the step-by-step principle1 and it is a striking example of what patience and ingenuity may accomplish in the management of what is reputedly the most elusive and difficult of the powers of nature4 ,the machine was some six years in being brought into practical form1 and was perfected only after a long series of experiments4 ,in its operation it deals with infinitesimal measurements and quantities4 ,the first attempts were on the variable current system1 which was later discarded for the step-by-step plan mentioned4 ,in writing an ordinary lead pencil may be used4 ,from the point of this two silk cords are extended diagonally1 their directions being at right angles to each other1 and the ends of these cords enter openings made for them in the cast iron case of the instrument on each side of the small desk on which the writing is done4 ,inside the case each cord is wound on a small drum which is mounted on a vertical shaft4 ,now if the pencil-point is moved straight upward or downward it is manifest that both shafts will move alike4 ,if the movement is oblique in any direction1 one of the shafts will turn more than the other1 and the degree of all these turnings of each shaft in reference to the other will be precisely governed by the direction in which the pencil-point is moved4 ,illustration3 ,,diagram ,,of ,,mechanical ,,telautograph4 ,,bow-,,drill ,,arrangement4 ,now1 suppose each shaft to carry a small1 toothed wheel1 and that upon these teeth a small arm rests4 ,as the wheel turns this arm will move as a pawl does on a ratchet4 ,imagine that at each slight depression between the ratchet-teeth it breaks a contact and cuts off a current1 and at each slight rise renews the contact and permits a current to pass4 ,this current affects an electro-magnet--one for each shaft--at the receiving end1 and each of these magnets1 when the current is on1 attracts an armature bearing a pawl1 which1 being lifted1 allows the notched wheel1 upon which it bears1 to turn to the extent of one notch4 ,the arrangement may be called an electric clutch1 that may be arranged in many ways1 and the detail of its action is unimportant in description1 so that it be borne in mind that each time a notch is passed in turning the shaft by drawing upon or relaxing the cords attached to the pencil-point1 an impulse of electricity is sent to an electro-magnet and armature which allows a corresponding wheel and its shaft to turn one notch1 or as many notches1 as are passed at the transmitting shaft4 ,in moving the pencil one inch to one side1 we will suppose it permits the shaft on which the cord is wound to turn forty notches4 ,then forty impulses of electricity have been sent over the wire1 the clutch has been released forty times1 and the shaft to which it is attached has turned precisely as much as the shaft has which was turned1 or was allowed to turn1 by the cord wound upon it and attached to the pencil4 ,it will be remembered that the arrangement is double4 ,there are two shafts operated by the writer's pencil--one on each side of it4 ,two corresponding shafts occupy relative positions in respect to the automatic pen of the receiving instrument4 ,there are two circuits1 and two wires are at present necessary for the operation of the instrument4 ,it remains to describe the manner of operating the automatic pen by connection with its two shafts which are turned by the step-by-step arrangement described1 precisely as much and at the same time as those of the transmitting instrument are4 ,illustration3 ,,work ,,of ,,the ,,telautograph4 ,,columbian ,,exposition1 #ahic4 ,to each shaft of the receiving instrument is attached an aluminum pen-arm by means of cords1 each arm being fixed1 in regard to its shaft1 as a bow drill is in regard to its drill4 ,these arms meet in the center of the writing tablet1 ,v-shaped1 as the cords are with relation to the writer's pencil in the sending instrument4 ,a small tube conveys ink from a reservoir along one of the pen-arms1 and into a glass tube upright at the junction of the arms4 ,this tube is the pen4 ,now1 let us imagine the pencil of the writer pushed straight upward from the apex of the ,v-shaped figure the cords and pencil-point make on the writing desk4 ,then both the shafts at the points of the arms of the ,v will rotate equally4 ,footnote3 ,see diagram of mechanical ,telautograph1 and of bow drill4 ,in the latter1 in ordinary use1 the stick and string2 rotate the spool4 ,rotating the spool will1 in turn1 move the stick and string1 and this is its action in the pen-arms of the ,telautograph4 ,the number of impulses sent from each of these shafts1 by the means explained1 will be equal4 ,each of the shafts of the receiving instrument will rotate alike1 and each draw up its arm of the automatic pen precisely as though one took hold of the points of the two legs of the ,v1 and drew them apart to right and left in a straight line4 ,this moves the apex of the ,v1 with its pen1 in a straight line upward at the same time the writer at the sending instrument pushed his pencil upward4 ,if this one movement1 considered alone1 is understood1 all the rest follow by the same means4 ,this is1 as nearly as it may be described without the use of technical mechanical terms1 the principle of the telautograph4 ,it must be seen that all that is necessary to describe any movement of the sender's pencil upon the paper under the receiving pen is that the rotating upright shafts of the latter should move precisely as much1 and at the same time1 with those two which get their movement from the wound cords and attached pencil-points in the hand of the writer4 ,only one essential item of the movement remains4 ,the shafts of both instruments must be rotated by some separate mechanical agency1 capable of being automatically reversed4 ,by an arrangement unnecessary to explain in detail1 the pencil of the writer lifted from the paper resting on the metallic table which forms the desk2 results in the automatic lifting of the pen from the paper at the receiving desk4 99 99 99 99 99 ,prof4 ,elisha ,gray was born in #ahce1 in ,ohio4 ,he was a blacksmith1 and later1 a carpenter4 ,but he was given to chemical and mechanical experiments rather than to the industries4 ,when twenty-one1 he entered ,oberlin ,college1 remaining there five years1 and earning all the money he spent4 ,he devoted his time chiefly to studies of the physical sciences4 ,as a young man he was an invalid4 ,later he was not remarkably successful in business1 failing several times in his beginnings4 ,his first invention was a telegraph self-adjusting relay4 ,it was not practically successful4 ,afterwards he was employed with an electrical manufacturing company at ,cleveland and ,chicago4 ,most of his earlier inventions in the line of electrical utility are not distinctively known4 ,he has never been idle1 and they all possessed practical merit4 ,for many years before he was known as the wizard of the telautograph1 he was foremost in the ranks of physicists and electricians4 ,he is not a discoverer of great principles1 but is professionally skillful and accomplished1 and eminently practical4 ,his every effort is exerted to avoid intricacy and clumsiness in machinery4 ,in #ahgh he was awarded the grand prize at the ,paris ,exposition1 and was given the degree of ,chevalier and the decorations of the ,legion of ,honor by the ,french ,government1 and again in #ahha1 at the ,electrical ,exposition at ,paris1 he was honored with the gold medal for his inventions4 ,he secured the degree of ,a4,m4 at ,oberlin ,college1 and was the recipient of the degree of ,ph4,d4 from the ,ripon 7,wis47 ,college4 ,for years he was connected with those institutions as non-resident ,lecturer in ,physics4 ,another ,university gave him the degree of ,,ll4,d4 ,he is a member of the ,american ,philosophical ,society1 the ,society of ,electrical ,engineers of ,england1 and the ,society of ,telegraph ,engineers of ,london4 ,he received an award and a certificate from the ,centennial ,exposition for his inventions in electricity4 ,the same lesson is to be gathered from his career1 so far1 that is given by the life of every noted ,american4 ,it means that money1 family1 prestige1 have no place as leverages of success in any field4 ,the rule is toward the opposite4 ,the qualities and capacities that win do so without these early advantages1 and all the more surely because there is an inducement to use them4 ,there is no luck4 ,,chapter ,,iii4 ,,the ,,electric ,,light4 ,illustration ,it has been stated that modern theory recognizes two classes of electricity1 the ,static and the ,dynamic4 ,the difference is1 however1 solely noticeable in operation4 ,of the dynamic class there can be no more common and striking example than the now almost universal electric light4 ,yet1 with a sufficient expenditure of chemicals and electrodes1 and a sufficient number of cells1 electric lighting1 either arc or incandescent1 can be as effectively accomplished as with the current evolved by a powerful dynamo4 ,footnote3 ,as an illustration of the day of beginnings1 a few years ago the thalus1 or lantern1 the pride of the rural ,congressman1 on the dome of the ,capitol at ,washington was lighted by electricity1 and an immense circular chamber beneath the dome was occupied by hundreds of cells of the ordinary form of battery4 ,the lamps were of the incandescent variety1 and what we now know as the filament was platinum wire4 ,vacuum bulb1 filament1 carbon1 dynamo1 were all unknown4 ,but the current1 and the heat of resistance1 and every fact now in use in electric lighting1 were there in operation4 ,the reader will understand that modern dynamic electricity owes its development to the principle of economy in production4 ,practical science most effectively awakens from its lethargy at the call of commerce4 ,nevertheless1 from the earliest moment in which it became known that electricity was akin to heat--that an interruption of the easy passage of a current produced heat--the minds of men were busy with the question of how to turn the tremendous fact to everyday use4 ,progress was slow1 and part of it was accidental4 ,the great servant of modern mankind was first an untrained one4 ,it was a marked advance when the gaslights in a theater could be all lighted at once by means of batteries and the spark of an induction coil4 ,the bottom of ,hell ,gate1 in ,new ,york harbor1 was blown out by ,gen4 ,newton by the same means1 and would have been impossible otherwise4 ,but these were only incidents and suggestions4 ,the question was how to make this instantaneous spark continuous4 ,there was pondering upon the fact that the only difference between heat and electricity is one of molecular arrangement4 ,heat is a molecular motion like that of electricity1 without the symmetry and harmony of action electricity has4 ,the vibrations of electricity are accomplished rapidly1 and without loss4 ,those of heat are slow1 and greatly radiated4 ,when a current of electricity reaches a place in the conductor where it cannot pass easily1 and the orderly vibrations of its molecules are disturbed1 they are thrown into the disorderly motion known as heat4 ,so1 when the conductor is not so good2 when a large wire is reduced suddenly to a small one2 when a good conductor1 such as copper1 has a section of resisting conduction1 such as carbon2 heat and light are at once evolved at that point1 and there is produced what we know as the electric light4 ,however concealed by machinery and devices1 and all the arrangements by which it is made more lasting1 steady1 economical and automatic1 it is no more nor less than this4 ,the difference between heat and electricity is only a difference in the rates of vibration of their molecules4 ,whatever the theory as to molecules1 or essence1 or actual nature and origin1 the practical fact that heat and light are the results of the circumstances described above remains4 ,this has long been known1 and the question remained how to produce an adequate current economically4 ,the result was the machine we know as the ,dynamo4 ,the first electric light was very brief and brilliant and was made by accident4 ,sir ,humphrey ,davy1 in #ahji1 in pulling apart the two ends of wires attached to a battery of two thousand small cells1 the most powerful generator that had been made to that time1 produced a brief and brilliant spark1 the result of momentarily imperfect contact4 ,every such spark1 produced since then innumerable times by accident1 is an example of electric lighting4 ,there are now in use in the ,united ,states some two million arc lights and nearly double that number of incandescent4 ,there are two principal systems of electric lighting2 one is by actually burning away the ends of carbon-points in the open air4 ,this is the arc4 ,the other is by heating to a white heat a filament of carbon1 or some substance of high resistance1 in a glass bulb from which the air has been exhausted4 ,this is the incandescent4 ,illustration3 ,,the ,,incandescent ,,light ,in the arc light the current passes across an imperfect contact1 and this imperfection consists in a gap of about one-sixteenth of an inch between the extremities of two rods of carbon carrying a current4 ,this small gap is a place of bad conduction and of the piling up of atoms1 producing heat1 burning1 light4 ,in the body of the lamp there are appliances for the automatic holding apart of the two points of the carbon1 and the causing of them to continually creep together1 yet never touch4 ,many devices have been contrived to this end4 ,with all theories and reasons well known1 and all effects accurately calculated1 upon this small arrangement depends the practical utility of the arc light4 ,the best arrangement is the invention of ,edison1 and is controlled most ingeniously by the current itself1 acting through the increased difficulty of its passage when the two carbon-points are too far apart1 and the increased ease with which it flows when they are too near together4 ,the current1 in leaping the small gap between the carbon-points1 takes a curved path1 hence the name arc light4 ,in passing from the positive to the negative carbon it carries small particles of incandescent carbon with it1 and consequently the end of the positive carbon is hollowed out1 while the end of the negative is built up to a point4 ,the incandescent light is in principle the same as the arc1 produced by the same means and based upon the same principle of impediment to the free passage of the current4 ,it was first produced by heating with the current to incandescence a fine platinum wire4 ,as stated above1 electricity that quietly traverses a large wire will suddenly develop great heat upon reaching a point where it is called upon to traverse1 a smaller one4 ,platinum was attempted for this place of greater resistance because of its qualities4 ,it does not rust1 has a low specific heat1 and is therefore raised to a higher temperature with less heat imparted4 ,but it was a scarce and expensive material1 and so long as it was heated to incandescence in the open air1 that is1 so long as its heat was fed as other heat is1 by oxygen1 it was slowly consumed4 ,platinum is no longer in the field of electric lighting1 and the substitute which takes its place in the present incandescent lamp1 and which is known as a filament1 is not heated in contact with the air4 ,the experiments and endeavors that brought this result constitute the story of the incandescent lamp4 ,the result is due to the patient intelligence of the ,american scientist and inventor1 ,thomas ,a4 ,edison4 ,after all the absolute essentials of a practical incandescent lamp had been thought out2 after the qualities and characteristics of the current were all known under the circumstances necessary to its use in lighting1 the practical accomplishment still remained4 ,edison is said to have once worked for several weeks in the making of a single loop-shaped carbon filament that would bear the most delicate handling4 ,this was then carefully carried to a glass-worker to be inclosed in a bulb1 and at the first movement he broke it1 and the work must be done over and done better4 ,it finally was4 ,the little pear-shaped bulb with its delicate loop of filament1 which cost months of toil and experiment at first1 is now a common article1 manufactured at an absurdly small cost1 packed in barrelfuls and shipped everywhere1 and consumed by the million4 ,a means has been found for producing the vacuum of its interior rapidly1 cheaply and thoroughly1 and the beautiful incandescent glow hangs in lines and clusters over the civilized world4 ,the phenomenon of incandescence without oxygen seems peculiar to these lights alone4 ,footnote3 ,the electric field1 previously explained1 seemed to exist by giving a magnetic quality to the surrounding air4 ,it would be as true if one should speak of a magnetized vacuum1 since the same field would exist in that as in surrounding air4 ,so simple are great facts when finally accomplished that there remains little to add on the subject of the mechanism of the electric light4 ,the two varieties1 arc and incandescent1 are used together as most convenient1 the large and very brilliant arc being especially adapted to out-of-doors situations1 and the gentler1 steadier and more permanent glow of the incandescent to interiors4 ,the latter is also capable of a modification not applicable to the arc4 ,it can1 in theaters and other buildings1 be turned down to a gentle1 blood-red glow4 ,the means by which this is accomplished is ingenious and surprising1 since it means that the supply of electricity over a wire--seemingly the most subtle and elusive essence on earth--may be controlled like a stream from a cock1 or the gas out of a burner4 ,but this reduction of the current that makes the red glow in the clusters in a theater is by no means the only instance4 ,the trolley-car1 and even the common motor1 may be made to start very slowly1 and the unseen current whose touch kills is fed to its consumer at will4 ,illustration ,,the ,,dynamo4--,to the man who has been all his life thinking of the steam engine as the highest and almost only embodiment of controlled mechanical power1 another machine1 both supplementary to the steam engine and far excelling it1 whose familiar burring sound is now heard in almost every village in the ,united ,states and has become the characteristic sound of modern civilization1 must constitute a source of continual question and surprise4 ,to be accustomed to the dynamo1 to look upon it as a matter of course and a conceded fact1 one must have come to years of maturity and found it here4 ,its practical existence dates back at furthest to #ahgj4 ,yet it is based upon principles long since known1 and can scarcely be said to be the invention of any one mind or man4 ,its lineal ancestor was the magneto-electric machine1 in the early construction of which figure the names of ,siemens1 ,wilde1 ,ladd1 and earlier and later electricians4 ,kidder's medical battery used forty years ago or more1 and still used and purchasable in its first form1 was a dynamo4 ,a footnote in a current encyclopedia states that3 ,an account of the ,magneto-electric machine of ,m4 ,gramme1 in the ,london ,standard of ,april #ith1 #ahgc1 confirmed by other information1 leads to the belief that a decided improvement has been made in these machines4 ,the word dynamo was then unknown4 ,later1 ,edison1 ,weston1 ,thompson1 ,hopkinson1 ,ferranti and others appear as improvers in the mechanism necessary for best developing a well-known principle1 and many of these improvements may be classed among original inventions4 ,as soon as the magneto-electric machine attained a size in the hands of experimenters that took it out of the field of scientific toys it began to be what we now know as a dynamo4 ,a paragraph in the encyclopedia referred to says1 in speaking of ,ladd1 of ,london1 ,these developments of electric action are not obtained without corresponding expenditure of force4 ,the armatures are powerfully attracted by the magnets1 and must be forcibly pulled away4 ,indeed1 one of ,wilde's machines1 when producing a very intense electric light1 required about five horse power to drive it4 ,illustration3 ,,magneto-,,electric ,,machine4 ,,the ,,predecessor ,,of ,,the ,,dynamo4 ,thus was the secret in regard to electric power unconsciously divulged some twenty years ago4 ,in all nature there is no recipe for getting something for nothing4 ,the modern dynamo1 apparently creating something out of nothing1 like all other machines gives back only what is given to it1 minus a fair percentage for waste1 loss1 friction1 and common wear4 ,its advantages amount to a miracle of convenience only4 ,so far as power is concerned1 it merely transfers it for long distances over a single wire4 ,so far as light is considered1 it practically creates it where wanted1 in new and convenient forms1 with a new intensity and beauty1 but with the same expenditure of transmitted energy in the form of burned coal as would be used in manufacturing the gas that was new1 wonderful1 and a luxury at the beginning of the century4 ,the dynamo is the most prominent instance of actual mechanical utility in the field of electrical induction4 ,it seems almost incredible that the apparently small facts discovered by ,faraday1 the bookbinder1 the employ of ,sir ,humphrey ,davy at weekly wages the struggling experimenter in the subtleties of an infant giant1 should have produced such results within sixty years4 ,footnote3 ,faraday was not entirely alone in his life of physical research4 ,he was associated with ,davy1 and quarreled with him about the liquefaction of chlorine and other gases1 and was the companion of ,wallaston1 ,herschel1 ,brand1 and others4 ,in connection with ,stodart1 he experimented with steel1 with results still considered valuable4 ,the scientific world still speaks of his quarrel with ,davy with regret1 since the personalities of great men should be free from ordinary weaknesses4 ,but ,lady ,davy was not a scientist1 and while the brilliant young mechanic was in her husband's employment for scientific purposes she insisted upon treating him as a servant1 whereat the independence of thinking which made him capable of wandering in fields unknown to conventionality and routine blazed into natural resentment4 ,the quarrel of #ahbc must have been greatly augmented1 in the lady's eyes1 in #ahbd1 for in that year ,faraday was made a member of the ,royal ,society4 ,in his lectures and public experiments he was greatly assisted by a man now almost forgotten1 an intelligent artilleryman named ,andersen4 ,this unknown soldier with a taste for natural science doubtless had his reward in the exquisite pleasure always derived from the personal verification of facts hitherto unknown4 ,there is often a pecuniary reward for the servant of science4 ,just as often there is not1 and the work done has been the same4 ,it was on ,christmas morning1 #ahba1 that ,faraday first succeeded in making a magnetic needle rotate around a wire carrying an electric current4 ,he was the discoverer of benzole1 the basis of our modern brilliant aniline dyes4 ,in #ahca he made the discovery he had been leading to for many years--that of magneto-electric induction4 ,all we have of electricity that is now a part of our daily life is the result of this discovery4 ,faraday was born in #agia1 and died ,august1 #ahfg1 in a house presented to him by ,victoria1 who had not the same opinion of his relations to the aristocracy that ,lady ,davy seems to have had4 ,his insight into science was something explainable only on the supposition that he was gifted with a kind of instinct4 ,he was a scientific prophet4 ,a man who could1 in #ahch1 foresee the ocean cable1 and describe those minute difficulties in its working that all in time came true1 must be classed as one of the great1 clear1 intuitive intellects of his race4 ,he was in youth apprenticed to a bookbinder1 and many of the books he bound he read4 ,a line in his indentures says3 ,in consideration of his faithful service1 no premium is to be given4 ,when these words were written there was no dream that the faithful service should be for all posterity4 ,illustration3 ,faraday's ,spark4 ,striking the leg of a horseshoe magnet with an iron bar wound with insulated wire causes a contact between loose end of wire and small disc1 and a spark4 ,faraday's ,first ,magneto-,electric ,experiment4 ,a horseshoe magnet passed near a bent soft iron wound with insulated wire caused an induced current in the wire4 ,,two ,,of ,,faraday',s ,,early ,,experiments ,,in ,,induction4 ,he who made the first actual machine to evolve a current in compliance with ,faraday's formulated laws was an ,italian named ,pix1 in #ahcb4 ,his machine consisted of a horseshoe magnet set on a shaft1 and made to revolve in front of two cores of1 soft iron wound with wire1 and having their ends opposite the legs of the magnet4 ,shortly after ,pix1 the inventors of the times ceased to turn the magnet on a shaft1 and turned the iron cores instead1 because they were lighter4 ,in like manner1 the huge field magnets of a modern dynamo are not whirled round a stationary armature1 but the armature is whirled within the legs of the magnet with very great rapidity4 ,the next step was to increase the number of magnets and the number of wire-wound iron cores--bobbins4 ,the magnets were made compound1 laminated2 a large number of thin horseshoe magnets were laid together1 with opposite poles touching4 ,these were all comparatively small machines--what we now1 with some reason1 regard as having been toys whose present results were rather long in coming4 ,illustration3 ,,the ,,siemens' ,,armature ,,and ,,winding4 ,,the ,,first ,,step ,,toward ,,the ,,modern ,,dynamo4 ,then came ,siemens1 of ,berlin1 in #aheg4 ,he was probably the first to wind the iron core1 what we now call the armature1 with wire from end to end1 lengthwise1 instead of round and round as a spool4 ,this resulted1 of course1 in the shaft of the armature being also placed crosswise to the legs of the magnet1 as it is in the modern dynamo4 ,one of the ends of the wire used in this winding was fastened to the axle of the armature1 and the other to a ring insulated from the shaft1 but turning with it4 ,two springs1 one bearing on the shaft and the other on the ring1 carried away the current through wires attached to them4 ,siemens also originated the mechanical idea of hollowing out the legs of the magnet on the inside for the armature to turn in close to the magnet1 almost fitting4 ,it was the first time any of these things had been done1 and their author probably had no idea that they would be prominent features of the dynamo of a little later time1 in all essentials closely imitated4 ,illustration3 ,,diagram ,,of ,,shaft1 ,,split ,,ring ,,and ,,brushes4 ,it will be guessed from what has been previously said on the subject of induction that the currents from such an electro-magnetic machine would be alternating currents1 the impulses succeeding each other in alternate directions4 ,to remedy this and cause the currents to flow always in the same direction1 the commutator was devised4 ,the ring mentioned above was split1 and the two springs both bore upon it1 one on each side4 ,the ends of the wires were both fastened to this ring4 ,the springs came to be known as brushes4 ,the effect was that one of them was in the insulated space between the split halves of the ring while the other was bearing on the metal to which the wire was attached4 ,this action was alternate1 and so arranged that the current carried away was always direct4 ,when an armature has a winding of more than one wire1 as the practical dynamo always has1 the insulated ring is divided into as many pieces as there are wires1 and the two brushes act as above for the entire series4 ,pacinotti1 of ,florence1 constructed a magneto-electric machine in which the current flows always in one direction without a commutator4 ,it has what is known as a ring armature1 and is the mother of all dynamos built upon that principle4 ,it is exceedingly ingenious in construction1 and for certain purposes in the arts is extensively used4 ,a description of it is too technical to interest others than those personally interested in the class of dynamo it represents4 ,wilde1 of ,manchester1 ,england1 improved the ,siemens machine in #ahff by doing that which is the feature that makes possible the huge field magnet of the modern dynamo1 which is not a magnet at all1 strictly speaking4 ,he caused the current1 after it had been rectified by the commutator1 to return again into coils of wire round the legs of his field magnets1 as shown in the diagram4 ,this induced in them a new supply of magnetism1 and this of course intensified the current from the armature4 ,it is true he had a separate smaller magneto-electric machine1 with which he evolved a current for the coil around the legs of the field magnet of a greatly larger machine upon which he depended for his actual current1 and that he did not know1 although he was practically doing the same thing1 that if he should divert this current made by the larger machine itself back through the coils of its field magnet1 he would not need the extra small machine at all1 and would have a much more powerful current4 ,illustration3 ,,simplest ,,form ,,of ,,dynamo ,and here arises a difference and a change of name4 ,all generating machines to this date had been called ,magneto-electric because they used permanent steel magnets with which to generate a current by the whirling of the bobbin which we now call an armature4 ,the time came1 led to by the improvement of ,wilde1 in which those steel permanent magnets were no longer used4 ,then the machine became the dynamo-electric machine1 and leaving off one word1 according to our custom1 dynamo4 ,siemens and ,wheatstone almost simultaneously invented so much of the dynamo as was yet incomplete4 ,it has cores--the parts that answer to the legs of a horseshoe magnet--of soft iron1 sometimes now even of cast iron4 ,these1 at starting1 possess very little magnetism--practically none at all--yet sufficient to generate a very weak current in the coils1 windings1 of the armature when it begins to turn4 ,this weak current1 passing through the windings of the field magnet1 makes these still stronger magnets1 and the effect is to evolve a still stronger current in the armature4 ,soon the full effect is reached4 ,the big iron field magnet1 often weighing some thousands of pounds1 is then the same as a permanent steel horseshoe magnet1 which would hardly be possible at all4 ,one who has watched the installation of a dynamo1 knowing that there is nowhere near any ordinary source of electricity1 and has seen its armature begin to whirl and hum1 and then in a few moments the violet sparklings of the brushes and the evident presence of a powerful current of electricity1 is almost justified in the common opinion that the genius of man has devised a machine to create something out of nothing4 ,it is true that a starting quantity of electricity is required4 ,it exists in almost every piece of iron4 ,sometimes1 to hasten first action1 some cells of a galvanic battery are used to pass a current through the coils of the field magnet4 ,after the first use there is always enough magnetism remaining in them during rest or stoppage to make a dynamo efficient after a few moments operation4 ,illustration3 ,,pacinotti',s ,,ring-,,armature ,,dynamo4 ,this is the dynamo in principle of action4 ,the varieties in construction now in use number scores1 perhaps hundreds4 ,some of them are monsters in size1 and evolve a current that is terrific4 ,they are all essentially the same1 depending for action upon the laws illustrated in the simplest experiment in induced electricity4 ,one of the best known of the modern machines is ,edison's1 represented in the picture at the head of this article4 ,in it the field magnet--answering to the horseshoe magnet of the magneto-electric machine--is plainly distinguishable to the unskilled observer4 ,it is not even solid1 but is made of several pieces bolted together4 ,its legs are hollowed at the ends to admit closely the armature which turns there4 ,there are valuable peculiarities in its construction1 which1 while complying in all respects with the dynamo principle1 utilize those principles to the best mechanical advantage4 ,so do others1 in other respects that did not occur even to ,edison1 or were not adopted by him4 ,probably the modern dynamo is the most efficient1 the most accurately measurable1 the least wasteful of its power1 and the most manageable1 of any power-machine so far constructed by man for daily use4 ,the motor4--,this is the twin of the dynamo4 ,in all essentials the two are of the same construction4 ,a difference in the arrangement of the terminals of the wire coils or the wrappings of armature and field magnet1 makes of the one a dynamo and of the other a motor4 ,nevertheless1 they are separate studies in electrical science4 ,practice has brought about modified constructions1 as in the case of the dynamo4 ,the differences between the two machines1 and their similarities as well1 may be explained by a general brief statement4 ,it is the work of the dynamo to convert mechanical energy into the form of electrical energy4 ,the motor1 in turn1 changes this electrical energy back again into mechanical energy4 ,where the electric light is produced by the dynamo current no motor intervenes4 ,the current is converted into heat and light by merely having an impediment1 a restriction1 a narrowness1 interposed to its free passage on a conducting wire1 as heretofore explained1 very much as water in a pipe foams and struggles at a narrow place or an obstruction4 ,where mechanical movements are to be produced by the dynamo current the motor is always the intermediate machine4 ,in the dynamo the armature is rotated by steam power1 producing an electrical energy in the form of a powerful current transmitted by a wire4 ,in the motor the armature1 in turn1 is rotated by this current4 ,it is but another instance of that ability to work backwards--to reverse a process--that seems to pervade all machines1 and almost all processes4 ,i have mentioned steam power1 and1 consequently1 the necessary burning of coal and expenditure of money in producing the dynamo current4 ,the dynamo and motor are not necessarily economical inventions1 but the opposite when the force produced is to be transmitted again1 with some loss1 into the same mechanical energy that has already been produced by the burning of coal and the making of steam4 ,across miles of space1 and into places where steam would not be possible1 the power is invisibly carried4 ,suggestions of this convenience--stated cases--it is not necessary to cite4 ,the fact is a prominent one1 to be noted everywhere4 ,and it may be made a mechanical economy4 ,the most prominent instance of this is the new utilization of ,niagara as a turbine water-power with which to whirl the armatures of gigantic dynamos1 using the power thus obtained upon motors1 and in the production of light and the transmission of power to neighboring cities4 ,the discovery of the possibility of transmitting power by a wire1 and converting it again into mechanical energy1 is a strange story of the human blindness that almost always attends an acuteness1 a thinking power1 a prescience1 that is the characteristic of humanity alone1 but which so often stops short of results4 ,this discovery has been attributed to accident alone2 the accident of an employ mistaking the uses of wires and fastening their ends in the wrong places4 ,but a ,french electrician thus describes the occurrence as within his own experience4 ,his name is ,hypolyte ,fontaine4 ,but let us first advert to the forgetfulness of the man who really invented the machine that was capable of the opposite action of both dynamo and motor4 ,this was the ,italian1 ,pacinotti4 ,footnote3 ,moses ,g4 ,farmer1 an ,american1 and celebrated in his day for intelligent electrical researches1 is claimed to have made the first reversible motor ever contrived4 ,a small motor made by ,farmer in #ahdg1 and embodying the electro-dynamic principle was exhibited at the great exposition at ,chicago in #ahic4 ,if the genealogy of this machine remains undisputed it fixes the fact that the discovery belongs to this country1 and to an ,american4 ,he mentioned that his machine could be used either to generate a current of electricity on the application of motive power to its armature1 or to produce motive power on connecting it with a source of electricity4 ,yet it did not occur to him to definitely experiment with two of his machines for the purpose of accomplishing that which in less than twenty years has revolutionized our ideas and practice in transmitted force4 ,he did not suggest that two of his machines could be run together1 one as a generator and the other as a motor4 ,he did not think of its advantages with the facilities for it1 of his own creation1 in his hands4 ,m4 ,fontaine states that at the ,vienna ,exposition of #ahgc there was a ,gramme machine intended to be operated by a primary battery1 to show that the ,gramme was capable of being worked by a current1 and1 as there was also a second machine of the same kind there1 of also generating one4 ,these two machines were to demonstrate this range of capacity as separately worked1 one by power1 the other with a battery4 ,there was1 then1 no intention of coupling them together as late as #ahgc1 with the means at hand and the suggestion almost unavoidable4 ,the dynamo and motor had not occurred to any one4 ,but ,m4 ,fontaine states that he failed to get the primary 7battery7 current in time for the opening1 and was troubled by the dilemma4 ,then the idea occurred to him1 as he could do no better1 to work one of the machines with a current deprived1 partly stolen1 from the other1 as a temporary measure4 ,a friend lent him the necessary piece of wire1 and he connected the two machines4 ,the machine used as a motor was connected with a pumping apparatus1 and when the machine intended as a generator started1 and this make-shift1 temporarily-stolen current was carried to the acting motor1 the action of the last was so much more vigorous than was intended that the water was thrown over the sides of the tank4 ,fontaine was forced to remedy this excessive action by procuring an additional wire of such length that its resistance permitted the motor to work more mildly and throw less water4 ,this accidentally established the fact of distance1 convenience1 a revolution in the power of the industrial world4 ,fontaine states that ,gramme had previously told him that he had done the same thing with his machines4 ,the idea was never patented4 ,neither ,pacinotti1 who invented the machine originally1 nor ,gramme1 one of the great names of modern electricity1 nor this skilled practical electrician1 ,fontaine1 who had charge of the exhibit of the ,gramme system at ,vienna1 considered the fact of the transmission of concentrated power over a thin wire to a great distance as one of value to its inventor or to the industries of mankind4 ,with the motor and the dynamo already made1 it was an accident that brought them together after all4 99 99 99 99 99 ,it may be amusing1 if not useful1 to spend a moment in reviewing of the efforts of men to utilize the power of the electrical current in mechanics before the day of the dynamo and a motor1 and while yet the electric light was an infant in the nursery of the laboratory4 ,they knew then1 about #ahce to #ahgj1 of the laws of induction as applied to the electro-magnet1 or in small machines the generating power1 so called1 of the magneto-electric arrangement embodied1 as a familiar example1 in ,kidder's medical battery4 ,there is a long list of those inventors1 ,american and ,european4 ,the first patent issued for an ,american electro-motor was in #ahcg1 to a man named ,thomas ,davenport1 of ,brandon1 ,vt4 ,he was a man far ahead of his times4 ,he built the first electric railroad ever seen1 at ,springfield1 ,mass41 in #ahce1 and considering the means1 whose inadequacy is now better understood by any reader of these lines than it then was by the deepest student of electricity1 this first railroad was a success4 ,davenport came as near to solving the problem of an electric motor as was possible without the invention of ,pacinotti4 ,following this there were many patents issued for electro-magnetic motors to persons residing in all parts of the country1 north and south4 ,one was made by ,c4 ,g4 ,page1 of the ,smithsonian ,institute1 in which the motive power consisted in a round rod1 acting as a plunger1 being pulled into the space where the core would be in an ordinary electro-magnet1 and thereby working a crank4 ,footnote3 ,the ,national ,intelligencer1 a prominent ,washington newspaper1 said with reference to ,page's motor ,he has shown that before long electro-magnetic action will have dethroned steam and will be the adopted motor1 etc4 ,this was an enthusiasm not based upon any fact then known about a machine not even in the line of the present facts of electro-dynamics4 ,a large motor of this kind is alleged1 in #ahej1 to have developed ten horse power4 ,it was actually applied to outdoor experiment as a car-motor on an actual railroad track1 and was efficient for several miles4 ,but it carried with it its battery-cells1 and they were disarranged and stirred by the jolting1 and being made of crockeryware were broken4 ,the chemicals cost much more than fuel for steam1 and there could be no economical motive for further experiment4 ,it was a huge toy1 as the entire sum of electrical science was until it was made useful first in the one instance of the telegraph1 and long after that date the use of the electro-magnet1 with a cam to cut off and turn on again the current at proper intervals1 which was the one principle of all attempts1 was a repeated and invariable failure4 ,that which was wanted and lacking was not known1 and was finally discovered and successively developed as has been described4 ,electric railroads4--,there was an instance of almost simultaneous invention in the case of the first practical electric railroads4 ,s4 ,d4 ,field1 ,dr4 ,siemens1 and ,thomas ,a4 ,edison all applied for patents in #ahhj4 ,of these1 ,field was first in filing1 and was awarded patents4 ,the combined dynamo and motor were1 of course1 the parents of the practical idea4 ,field's patents covered a motor in or under the car1 operated by a current from a stationary source of electricity--of course a dynamo4 ,these first electric roads had the current carried on the rail4 ,they were partially successful1 but there was something wrong in the plan1 and that something was induction by the earth4 ,later came1 as a remedy for this1 the ,trolley system2 the trolley being a small1 grooved wheel running upon a current-carrying wire overhead4 ,the question of how best to convey a current to the car-motor is a serious one1 doubtless at this moment occupying the attention of highly-trained intelligence everywhere4 ,the motor current is one of high power1 and as such intractable2 and it is in the character of this current1 rather than in methods of insulation1 that the remedy for the much-objected-to overhead wire is to be found4 ,it will be remembered that all the phenomena of induction are unhindered by insulation4 ,aside from the current-carrying problem1 the electric road is explainable in all its features upon the theory and practice of the dynamo and motor4 ,it is merely an application of the two machines4 ,the last is1 in usual practice1 under the car1 and geared to the truck-axle4 ,a more modern mechanical improvement is to make the axle the shaft of the motor armature4 ,when the motor has used the current it passes by most systems into the rail and the ground4 ,by others there is a metallic circuit--two wires4 ,many men whose interest and occupation leads them to a study of such matters know that the use of electricity1 instead of steam locomotion1 is merely a question of time on all railroads4 ,i have said elsewhere that the actual age of electricity had not yet fully come4 ,it seems to us now that we have attained the end2 that there is little more to know or to do4 ,but so have all the generations thought in their day4 ,in the field of electricity there are yet to come practical results of which one may have some foreshadowings in the experiments of men like ,tesla1 which will make our present times and knowledge seem tame and slow4 ,electrolysis4--,in all history1 fire has been the universal practical solvent4 ,it has been supplanted by the electrical current in some of the most beautiful and useful phenomena of our time4 ,electrolysis is the name of the process by which fluid chemicals are decomposed by the current4 ,a familiar early experiment in electrolysis is the decomposition of water--a chemical composed of oxygen and hydrogen1 though always thought of and used as a simple1 pure fluid4 ,if the poles of a galvanic battery are immersed in water slightly mixed with sulphuric acid to favor electrical action1 these poles will become covered with bubbles of gas which presently rise to the surface and pass off4 ,these bubbles are composed of the two constituents of water1 the oxygen rising from the positive and the hydrogen from the negative pole4 ,particles of the substance decomposed are transferred1 some to one pole and some to the other2 and1 therefore1 electrolysis is always practiced in a fluid in order that this transference may more readily occur4 ,the quantity of electrolyte--the substance decomposed--that is transferred in a given time is in proportion to the strength of the current4 ,when this electrolyte is composed of many substances a current will act a little on all of them1 and the quantity in which the elementary bodies appear at the poles of the current depends upon the quantities of the compounds in the liquid1 and on the relative ease with which they yield to the electrical action4 ,the electrolytic processes are not the mere experiments a brief description of them would indicate1 but are among the important processes for the mechanical products of modern times4 ,the extensive nickel-plating that became a permanent fad in this country on the discovery of a special process some years ago1 is all done by electrolysis4 ,the silver plating of modern tableware and table cutlery1 as beautiful and much less expensive than silver1 and the fine finish of the beautiful bronze hardware now used in house-furnishing1 are the results of the same process4 ,some use for it enters into almost every piece of fine machinery1 and into the beautifying or preserving of innumerable small articles that are made and used in unlimited quantity4 ,the process and its principle is general1 but there are many details observed in the actual work of electroplating which interest only those engaged4 ,one of the most usual of these is that of making an electrotype4 ,this may mean the making of an exact impression of a medal1 coin1 or other figure1 or a depositing of a coating of the same on any metallic surface4 ,formerly the faces of the types used in printing were very commonly faced with copper to give them finish and a wearing quality4 ,even fresh1 natural fruits that have been evenly coated with plumbago may be covered with a thin shell of metal4 ,a silver head may be placed on the wood of a walking stick1 precisely conforming on the outside to the form of the wood within4 ,the deposit of metal in the electrotyping process always takes place at the negative pole--the pole by which the current passes out of the fluid into its conductor4 ,this is the cathode4 ,the other is the anode4 ,the bath1 as the fluid in which the process is accomplished is called1 for silver1 gold or platinum contains one hundred parts of water1 ten of potassium cyanide1 and one of the cyanide of whichever of those metals is to be deposited4 ,the articles to be plated are suspended in this bath and the battery-power1 varying in intensity according to circumstances1 is applied4 ,after removal they are buffed and finished4 ,a varying detail is practiced for different metals1 and the current now commonly used is from a dynamo4 ,footnote3 ,among modern modifications of the dynamic current1 is its use1 modified by proper appliances1 for the telegraph and the telephone circuits of cities and the larger towns4 ,every electric current may now be safely attributed to that source1 and from the same circuit and generator all modifications may be produced at once4 ,the origin of electrolysis is said to be with ,daniell1 who noticed the deposit of copper while experimenting with the battery that bears his name4 ,jacobi1 at ,st4 ,petersburg1 first published a description of the process in #ahci4 ,the ,elkingtons were the first to actually put the process into commercial practice4 ,it would be interesting now1 were it apropos1 to describe the seemingly very ancient processes by which our ancestors gilded1 plated1 were deceived and deceived others1 previous to about #ahde4 ,for those things were done1 and the genuineness of life has by no means been destroyed by the modern ease with which a precious metal may be deposited upon one utterly base4 ,a contemplation of the moral side of the subject might lead at once to the conclusion that we could now spare one of the least in actual importance of the processes of the all-pervading and wonderful essence that alike makes the lightning-stroke and gilds the plebeian pin that fastens a baby's napkin4 ,but from any other view we could not now dispense with anything electricity does4 ,general facts4--,the names of many of the original investigators of electrical phenomena are perpetuated in the familiar names of electrical measurements4 ,for1 notwithstanding its seeming subtlety1 there is no force in use1 or that has ever been used by men1 capable of being so definitely calculated1 measured1 determined beforehand1 as electricity is4 ,as time passes new measurements are adopted and named1 some of them being proposed as lately as #ahic4 ,an instance of the value of some of these old determinations of a time when all we now know of electrical science was unknown1 may be given in what is known as ,ohm's ,law4 ,ohm was a native of ,erlangen1 in ,bavaria1 and was ,professor of ,physics at ,munich1 where he died in #ahgd4 ,he formulated this ,law in #ahbg1 and it was translated into ,english in #ahdg4 ,he was recognized at the time1 and was given the ,copley medal of the ,royal ,society of ,london4 ,the ,law--for by that distinctive name is it still called1 though the name ,ohm1 also expresses a unit of measurement--is that the quantity of current that will pass through a conductor is proportional to the pressure and inversely proportional to the distance4 ,that is3 ,current ,pressure _/ ,resistance4 ,transposing the terms of the equation we may get an expression for either of those elements1 current1 pressure1 or resistance1 in the terms of the other two4 ,this relation holds true and is accurate in every possible case and condition of practical work4 ,this remarkable precision and definiteness of action has made possible the creation of an extensive school of electrical testing1 by which we are not only enabled to make accurate measurement of electrical apparatus and appliances1 but also to make determinations in other fields by the agency of electricity4 ,when an ocean cable is injured or broken the precise location of the trouble is made by measuring the electrical resistance of the parts on each side of the injury4 ,the magnitudes of measurements of electricity are expressed in the following convenient electrical units3 ,the ,,volt 7named from ,volta7 equals a unit of pressure that is equal to one cell of a gravity battery4 ,the ,,ohm1 as a unit of measurement1 equals a unit of resistance that is equivalent to the resistance of a hundred feet of copper wire the size of a pin4 ,the ,,amp,,re 7named from ,ampre1 #agge-ahcf1 author of a ,collection of ,observations on ,electro-,dynamics and other works1 and a profound practical investigator7 equals a unit of current equivalent to the current which one ,volt of pressure will produce through one ,ohm of wire 7or resistance74 ,the ,coulomb 7#agcf--;inventor of the means of measuring electricity called the ,torsion balance1 and general early investigator7 equals a unit of quantity of one ,ampere flowing for one second4 ,the ,farad 7from ,faraday1 the discoverer of the laws of ,induction1 see ante71 equals that unit of capacity which is the capacity for holding one ,coulomb4 ,death current4--,what is now spoken of as the ,death ,current is one that will instantly overcome the resistance of the human1 or animal1 body4 ,it is a current of from one to two thousand ,volts--about the same as that used in maintaining the large arc lights4 ,this question of the killing capacity of the current became officially prominent some years ago1 upon the passage by the legislature of the ,state of ,new ,york of a statute requiring the death penalty to be inflicted by means of electricity4 ,the object was to deter evildoers by surrounding the penalty with scientific horror1 ,footnote3 ,hence also the new lingual atrocity1 the word electrocute1 derived from execute by decapitation and the addition of electro and the idea had its origin in the accidents which formerly occurred much more frequently than now4 ,the death current is now almost everywhere1 though the care of the men who continually work about live wires has grown to be much like that of men who continually handle firearms or explosives1 and accidents seldom happen4 ,at first it was apparently difficult for the general public to appreciate the fact that the silent and harmless-looking wires must be avoided4 ,there was suddenly a new and terrific power in common use1 and it was as slender1 silent and unobtrusive as it was fatal4 ,insulation of the hands by the use of rubber gloves1 and extreme care1 are the means by which those who are called linemen--a new industry--protect themselves in their occupation4 ,but there is a new commandment added to the list of those to be memorized by the body-politic4 ,do not tread upon1 drive over1 or touch any wire4 ,it may be1 and probably is1 harmless4 ,but you cannot positively know4 ,footnote3 ,it is a common trait of general human nature to refuse to learn save by the hardest of experiences1 and so far as the crediting of statements is concerned1 to at first believe everything that is not true1 and reject most that is4 ,the supernatural1 the phenomena of alleged witchcraft and diabolism1 and of luck1 hoodoo1 fate1 etc41 find ready disciples among those who reject disdainfully the results of the working of natural law4 ,when the railroads were first built across the plains the ,indians repeatedly attempted to stop moving trains by holding the ends of a rope stretched across the track in front of the engine1 and with results which greatly surprised them ,when the lines were first constructed in northern ,mexico the ,mexican peasant could not be induced to refrain from trying personal experiments with the new power1 and scores of him were killed before he learned that standing on the track was dangerous4 ,in the ,united ,states the era of accidents through indifference to common-looking wires has almost passed1 but for some years the fatality was large because people are always governed by appearances connected with previous notions1 until new experiences teach them better4 ,,instruments ,,of ,,measurement4--,some of the most costly and beautiful of modern scientific instruments are those used in the measurements and determinations of electrical science4 ,there are many forms and varieties for every specific purpose4 ,electrical measurement has become a department of physical science by itself1 and a technical1 extensive and varied one4 ,already the electrical specialist1 no more an original experimenter or investigator than the average physician is1 has become professional4 ,he makes plans1 submits facts1 estimates cost1 and states results with almost certainty4 ,,electricity ,,as ,,an ,,industry4--,immense factories are now devoted to the manufacture of electrical goods exclusively4 ,large establishments in cities are filled with them4 ,the installation of the electric plant in a dwelling house is done in the same way1 and as regularly1 as the plumbing is4 ,soon there must be still another enlargement1 since the heating of houses through a wire1 and the kitchen being equipped with cooking utensils whose heat is for each vessel evolved in its own bottom1 is inevitable4 ,the following are some of the facts1 in figures1 of the business side of electricity in the ,united ,states at the present writing4 ,in #ahff1 about twenty years after the establishment of the telegraph1 but with a population of only a little more than half the present1 there were #ge1fhf miles of telegraph wire in use1 and #b1ebj offices4 ,in #ahic there were #gdj1jjj miles of wire1 and more than #bj1jjj offices4 ,the receipts for the year first named are unknown1 but for #ahic they were about #bd1jjj1jjj4 ,the expenses of the system for the same year were #af1ejj1jjj4 ,the telephone1 an industry now about sixteen years old1 had in #ahic1 for the ,bell alone1 over #bjj1jjj miles of wire on poles1 and over #ij1jjj miles of wire under ground4 ,the instruments were in #ae1jjj buildings4 ,there were #aj1jjj employs1 and #bcc1jjj subscribers4 ,all companies combined had #dda1jjj miles of wire4 ,ninety-two millions of dollars were invested in telephone fixtures4 ,in #ahic1 the average cost of a telegram was thirty-one and one six-tenths cents1 and the average alleged cost of sending the same to the companies was twenty-two and three-tenths cents1 leaving a profit of nine and three-tenths cents on every message4 ,it must be remembered that with mail facilities and cheapness that are unrivalled1 the telegraph message is always an extraordinary mode of communication2 an emergency4 ,these few figures may serve to give the reader a dim idea of the importance to which the most ordinary and general of the branches of electrical industry have grown in the ,united ,states4 ,,medical ,,electricity4--,for more than fifty years the medical fraternity in regular practice persisted in disregarding all the claims made for the electric current as a therapeutic agent4 ,in earlier times it was supposed to have a value that supplanted all other medical agencies4 ,franklin seems to have been one of the earliest experimenters in this line1 and to have been successful in many instances where his brief spark from the only sources of the current then known were applicable to the case4 ,the medical department of the science then fell into the hands of charlatans1 and there is a natural disposition to deal in the wonderful1 the miraculous or semi-miraculous1 in the cure of disease4 ,divested of the wonder-idea through a wider study and greater knowledge of actual facts1 electricity has again come forward as a curative agent in the last ten years4 ,instruction in its management in disease is included in the curriculum of almost every medical school1 and most physicians now own an outfit1 more or less extensive1 for use in ordinary practice4 ,to decry and utterly condemn is no longer the custom of the steady-going physician1 the ethics of whose cloth had been for centuries to condemn all that interfered with the use of drugs1 and everything whose action could not be understood by the examples of common experience1 and without special study outside the lines of medical knowledge as prescribed4 ,perhaps the developments based upon the discoveries of ,faraday have had much to do with the adoption of electricity as a curative agent4 ,the current usually used is the ,faradic2 the induced alternate current from an induction coil4 ,this is1 indeed1 the current most useful in the majority of the nervous derangements in the treatment of which the current is of acknowledged utility4 ,in surgery the advance is still greater4 ,galvano-cautery is the incandescent light precisely2 the white-hot wire being used to cut off1 or burn off1 and cauterize at the same time1 excrescences and growths that could not be easily reached by other means than a tube and a small loop of platinum wire4 ,a little incandescent lamp with a bulb no bigger than a pea is used to light up and explore cavities1 and this advance alone1 purely mechanical and outside of medical science1 is of immense importance in the saving of life and the avoidance of human suffering4 ,it may be added that there is nothing magical1 or by the touch1 or mysterious1 in the treatment of disease by the electrical current4 ,the results depend upon intelligent applications1 based upon reason and experience1 a varied treatment for varying cases4 ,nor is it a remedy to be applied by the patient himself more than any other is4 ,on the contrary1 he may do himself great injury4 ,the pills1 potions1 powders and patent medicines made to be taken indiscriminately1 and which he more or less understands1 may be still harmful yet much safer4 ,even the application of one or the other of the two poles with reference to the course of a nerve1 may result in injury instead of good4 ,,incomplete ,,possibilities4--,there are at least two things greatly desired by mankind in the field of electrical science and not yet attained4 ,one of these1 that may now be dismissed with a word1 is the resolving of the latent energy of1 say a ton of coal1 into electrical energy without the use of the steam engine2 without the intervention of any machine4 ,for electricity is not manufactured2 not created by men in any case4 ,it exists1 and is merely gathered1 in a measure and to a certain extent confined and controlled1 and sent out as a concentrated form of energy on its various errands4 ,should a means for the concentration of this universally diffused energy be found whereby it could be made to gather1 by the new arrangement of some natural law such as places it in enormous quantities in the thundercloud1 a revolution that would permeate and visibly change all the affairs of men would take place1 since the industrial world is not a thing apart1 but affects all men1 and all institutions1 and all thought4 ,the other desideratum1 more reasonable apparently1 yet far from present accomplishment1 is a means of storing and carrying a supply of electricity when it has been gathered by the means now used1 or by any means4 ,,the ,,storage ,,battery is an attempt in this last direction4 ,the name is misleading1 since even in this attempt electricity is in no sense stored1 but a chemical action producing a current takes place in the machine4 ,the arrangement is in its infancy4 ,instances occur in which1 under given circumstances1 it is more or less efficient1 and has been improved into greater efficiency4 ,but many difficulties intervene1 one of which is the great weight of the appliances used1 and another1 considerable cost4 ,the term storage battery is now infrequently used1 and the name secondary battery is usually substituted4 ,the principle of its action is the decomposing of combined chemicals by the action of a current applied from a stationary generator or dynamo1 and that these chemicals again unite as soon as they are allowed to do so by the completing of a circuit1 and in re-combining give off nearly as much electricity as was first used in separating them4 ,the action of the secondary1 storage1 battery1 once charged1 is like that of a primary battery4 ,the current is produced by chemical action4 ,two metals outside of the solution contained in a primary battery cell1 but under differing physical conditions from each other1 will yield a current4 ,a piece of polished iron and a piece of rusty iron1 connected by a wire1 will yield a small current4 ,rusty lead1 so to speak1 so connected with bright lead1 has a high electromotive force4 ,oxygen makes lead rusty1 and hydrogen makes it bright4 ,oxygen and hydrogen are the two gases cast off when water is subjected to a current4 7,see ante under ,electrolysis7 ,so ,augustin ,plant1 the inventor of as much as we yet have of what is called a storage or secondary battery1 suspended two plates of lead in water1 and when a current of electricity was passed through it hydrogen was thrown off at one plate1 making it bright1 and oxygen at the other plate1 peroxydizing its surface4 ,when the current was removed the altered plates1 connected by a wire1 would send off a current which was in the opposite direction from the first1 and this would continue until the plates were again in their original condition4 ,this is the principle and mode of action of the storage battery4 ,so far it has assumed many forms4 ,scores of modifications have been invented and patented4 ,the leaden plates have taken a variety of forms1 yet have remained leaden plates1 one cleaned and the other fouled by the electrolytic action of a current1 and giving off an almost equivalent current again by the return process4 ,the arrangement endures for several repetitions of the process1 but is finally expensive and always inconvenient4 ,the secondary battery1 in its infancy1 as stated1 presents now much the same obstacles to commercial use the galvanic1 or primary1 battery did before the induced current had become the servant of man4 ,,chapter ,,iv4 ,,electrical ,,invention ,,in ,,the ,,united ,,states4 ,a list of the electrical inventors of this country would be very long4 ,many of the names are1 in the mass and number of inventions1 almost lost4 ,it happens that many of the practical applications described in this volume1 indeed most of them1 are the work of citizens of this country4 ,in previous chapters ,i have referred briefly to ,franklin1 ,morse1 ,field1 and others4 ,these men have left names that1 without question1 may be regarded as permanent4 ,their chiefest distinguishing trait was originality of idea1 and each one of them is a lesson to the ,american boy4 ,in a sense the greatest of all these1 and in the same sense1 the greatest ,american1 was ,benjamin ,franklin4 ,a sketch of his career has been given1 but to that may be added the following3 ,he had arrived at conclusions that were vast in scope and startling in result by applying the reasoning faculty upon observations of phenomena that had been recurring since the world was made1 and had been misunderstood from the beginning4 ,he used the simplest means4 ,his experiment was in a different way daily performed for him by nature4 ,he was philosophically daring1 indifferently a tinker with nature's terrific machinery2 a knocker at the door of an august temple that men were never known to have entered2 a mortal who smiled in the face of inscrutable and awful mystery1 and who defied the lightning in a sense not merely moral4 ,footnote3 ,professor ,richmann1 of ,st4 ,petersburg1 was instantly killed by lightning while repeating ,franklin's experiment4 ,his genius lay in a power of swift inductive reasoning4 ,his common sense and his sense of humor never forsook him4 ,he uttered keen apothegms that have lived like those of ,solon4 ,he was a philosopher like ,diogenes1 lacking the bitterness4 ,he wrote the ,busy-,body1 and annually made the plebeian and celebrated ,almanac1 and the ,ephemera that were not ephemeral1 and is the author of the story of ,the ,whistle1 that everybody knows1 and everybody reads with shamefacedness because it is a brief chapter out of his own history4 ,he was apparently an adept in the art of caring for himself1 one of the most successful worldings of his time1 yet he wrote1 thought1 toiled incessantly1 for his fellow men4 ,he had little education obtained as it is supposed an education must be obtained4 ,he was commonplace4 ,no one has ever told of his silver tongue1 or remembered a brilliant after-dinner speech that he has made4 ,yet he finally stood before mankind the companion of princes1 the darling of splendid women1 covered with the laurels of a brilliant scientific renown4 ,but he was a printer1 a tinkerer with stoves1 the inventor of the lightning rod1 the man who had spent one-half his life in teaching apprentices1 such as he himself had been when his jealous and common-minded brother had whipped him1 that time is money1 that credit is money--which is the most prominent fact in the commercial world of #ahie--;and that honor and self-respect are better than wealth1 pleasure1 or any other good4 ,yet clear1 keen1 cold and inductive as was ,franklin's mind1 no vision reached him1 in the moment of that triumph when he felt the lightning tingling in his fingers from a hempen string1 of those wonders which were to come4 ,he knew absolutely nothing of that necromancy through which others of his countrymen were to girdle the world with a common intelligence1 and yet others were to use in sprinkling night with clusters as innumerable and mysterious as the higher stars4 ,the story of the ,morse telegraph has been repeatedly told1 and ,i have briefly sketched it in connection with the subject of the telegraph4 ,but1 unlike the original1 scientifically lonely and independent ,franklin1 ,morse had the best assistance of his times in the persons of men more skilled than himself and almost as persistent4 ,the chief of these was ,alfred ,vail1 a name until lately almost unknown to scientific fame1 who eliminated the clumsy crudities of ,morse's conception1 remade his instruments1 and was the inventor of that renowned alphabet which spells without letters or writing or types1 that may be seen or heard or felt or tasted1 that is adapted to any language and to all conditions1 and that performs to this day1 and shall to all time1 the miracle of causing the inane rattle of pieces of metal against each other to speak to even a careless listener the exact thoughts of one a thousand miles away4 ,another of the men who might be appropriately included in any comprehensive list of aiders and abettors of the present telegraph system were ,leonard ,d4 ,gale1 then ,professor of ,chemistry in the ,university of ,new ,york1 and ,professor ,joseph ,henry1 who had made1 and was apparently indifferent to the importance of it because there was no alphabet to use it with1 the first electric telegraph ever constructed to be read1 or used1 by sound4 ,last1 though hardly least if all facts are understood1 might be included a skillful youth named ,william ,baxter1 afterwards known as the inventor of the ,baxter ,engine1 who1 shut in a room with ,vail in a machine shop in ,new ,jersey1 made in conjunction with the author of the alphabet the first telegraphic instrument that1 with ,henry's magnet and battery cells1 sent across space the first message ever read by a person who did not know what the words of the message would say or mean until they had been received4 ,after the telegraph the state of electrical knowledge was for a long time such that electrical invention was in a sense impossible4 ,the renowned exploit of ,field was not an invention1 but a heroic and successful extension of the scope and usefulness of an invention4 ,but thought was not idle1 and filled the interval with preparations for final achievements unequaled in the history of science4 ,two of these results are the electric light and the telephone4 ,for the various candles1 such as that of ,jablochkoff1 exhibited at ,paris in #ahgj1 only served to stimulate investigation of the alluring possibilities of the subject4 ,the details of these great inventions are better known than those of any others4 ,the telegraph and the newspaper reporter had come upon the field as established institutions4 ,every process and progress was a piece of news of intense interest4 ,when the light glowed in its bulb and sparkled and flashed at the junction points of its chocolate-colored sticks it had been confidently expected4 ,there was little surprise4 ,the practical light of the world was considered probable1 profitable1 and absolutely sure4 ,the real story will never be told4 ,the thoughts1 which phrase may also include the inevitable disappointments of the inventor1 are never written down by him4 ,that variety of brain which1 with a few great exceptions1 was not known until modern1 very recent times1 which does not speculate1 contrive1 imagine only1 but also reduces all ideas to commercial form1 has yet to have its analysis and its historian1 for it is to all intents a new phase of the evolution of mind4 ,illustration3 ,,thomas ,a4 ,,edison4 ,a typical example of this class of intellect is ,mr4 ,thomas ,a4 ,edison4 ,it may be doubted if such a man could1 in the qualities that make him remarkable1 be the product of any other country than ours4 ,in common with nearly all those who have left a deep impression upon our country1 ,edison was the child of that hackneyed respectable poverty which here is a different condition from that existing all over ,europe1 where the phrase was coined4 ,there1 the phrase1 and the condition it describes1 mean a dull content1 an incapacity to rise1 a happy indifference to all other conditions1 a dullness that does not desire to learn1 to change1 to think4 ,to respectable poverty in other civilizations there are strong local associations like those of a cat1 not arising to the dignity of love of country4 ,in the ,united ,states1 without a word1 without argument or question1 a young man becomes a pioneer--not necessarily one of locality or physical newness1 but a pioneer in mind--in creed1 politics1 business--in the boundless domain of hope and endeavor4 ,in ,america no man is as his father was except in physical traits4 ,no man there is a volunteer soldier fighting his country's battles except from a conviction that he ought to be4 ,a man is an inventor1 a politician1 a writer1 first because he knows that valuable changes are possible1 and1 second1 because he can make such changes profitable to himself4 ,it is the great realm of immutable steadfastness combined with constant change2 unique among the nations4 ,edison never had more than two months regular schooling in his entire boyhood4 ,there is1 therefore1 nothing trained1 regular1 technical1 about him4 ,if there had been it is probable that we might never have heard of him4 ,he is one of the innumerable standing arguments against the old system advocated by everybody's father1 and especially by the older fathers of the church1 and which meant that every man and woman was practically cut by the same pattern1 or cast in the same general mould1 and was to be fitted for a certain notch by training alone4 ,no more than thirty years ago the note of preparation for the grooves of life was constantly sounded4 ,natural aptitude1 bent1 inclination1 were disregarded4 ,the maxim concocted by some envious dull man that genius is only another name for industry1 was constantly quoted and believed4 ,but ,edison's mother had been trained1 practically1 as an instructor of youth4 ,he had hints from her in the technical portions of a boy's primary training4 ,he is not an ignorant man1 but1 on the contrary1 a very highly educated one4 ,but it is an education he has constructed for himself out of his aptitudes1 as all other actual educations have really been4 ,when he was ten years old he had read standard works1 and at twelve is stated to have struggled1 ineffectually perhaps1 with ,newton's ,principia4 ,at that age he became a train-boy on the ,grand ,trunk railroad for the purpose of earning his living2 only another way of pioneering and getting what was to be got by personal endeavor4 ,while in that business he edited and printed a little newspaper2 not to please an amateurish love of the beautiful art of printing1 but for profit4 ,he was selling papers1 and he wanted one of his own to sell because then he would get more out of it in a small way4 ,he never afterwards showed any inclination toward journalism1 and did not become a reporter or correspondent1 or start a rural daily4 ,while he was a train-boy1 enjoying every opportunity for absorbing a knowledge of human nature1 and of finally becoming a passenger conductor or a locomotive engineer1 something called his attention to the telegraph as a promoter of business1 as a great and useful institution1 and he resolved to become an operator4 ,this was his electrical beginning4 ,yet before he took this step he was accused of a proclivity toward extraordinary things4 ,in the old caboose where he edited1 set up1 and printed his newspaper he had established a small chemical laboratory1 and out of these chemicals there is said to have been jolted one day an accident which caused him some unpopularity with the railroad people4 ,he was all the time a business man4 ,he employed four boy helpers in his news and publishing business4 ,it took him a long time to learn the telegraph business under the circumstances1 and when he was at last installed on a plug circuit he began at once to do unusual things with the current and its machines and appliances4 ,this is what he tells of his first electrical invention4 ,there was an operator at one end of the circuit who was so swift that ,edison and his companion could not take fast enough to keep up with him4 ,he found two old ,morse registers--the machines that printed with a steel point the dots and dashes on a paper slip wound off of a reel4 ,these he arranged in such a way that the message written1 or indented1 on them by the first instrument were given to him by the second instrument at any desired rate of speed or slowness4 ,this gave to him and his friend time to catch up4 ,this1 in ,morse's time1 would have been thought an achievement4 ,edison seems to regard it as a joke4 ,there was no time for prolonged experiment4 ,it was an emergency1 and the idea must necessarily have been supplemented by a quick mechanical skill4 ,it was this same automatic recorder1 the idea embodied in it1 that by thought and logical deduction afterwards produced that wonderful automaton1 the phonograph4 ,he rigged a hasty instrument that was based upon the idea that if the indentations made in a slip of paper could be made to repeat the ticking sound of the instrument1 similar indentations made by a point on a diaphragm that was moved by the voice might be made to repeat the voice4 ,his rude first instrument gave back a sound vaguely resembling the single word first shouted into it and supposed to be indented on a slip of paper1 and this was enough to stimulate further effort4 ,he finally made drawings and took them to a machinist whom he knew1 afterwards one of his assistants1 who laughed at the idea but made the model4 ,previously he bet a friend a barrel of apples that he could do it4 ,when the model was finished he arranged a piece of tin foil and talked into it1 and when it gave back a distinct sound the machinist was frightened1 and ,edison won his barrel of apples1 which1 he says1 ,i was very glad to get4 ,the ,wizard is a man evidently pertaining to the class of human eccentrics who excite the interest of their fellow-men to see what they will do next1 but without any idea of the final value of that which may come by what seems to them to be mere unbalanced oddity4 ,such people are invariably misunderstood until they succeed4 ,when he invented the automatic repeating telegraph he was discharged1 and walked from ,decatur to ,nashville1 #aej miles1 with only a dollar or two as his entire possessions4 ,with a pass thence to ,louisville1 he and a friend arrived at that place in a snowstorm1 and clad in linen dusters4 ,this does not seem scientific or professor-like1 but it has not hindered2 possibly it has immensely helped4 ,it reminds one of the ,franklinic episodes when remembered in connection with future scientific renown and the court of ,france4 ,one of the secrets of ,edison's great success is the ease with which he concentrates his mind4 ,he is said to possess the faculty of leaving one thing and taking up another whenever he wills4 ,he even carries on in his mind various trains of thought at the same time4 ,the operations of his brain are imitated in his daily conduct1 which is direct and simple in all respects4 ,he is never happier than when engaged in the most absorbing and exacting mental toil4 ,he dresses in a machinist's clothes when thus employed in his laboratory1 and was long accustomed to work continuously for as long as he was so inclined without regard to regularity1 or meals1 or day or night4 ,he is willing to eat his food from a bench that is littered with filings1 chips and tools4 ,to relieve strain and take a moment's recreation he is known to have bought a cottage organ and taught himself to play it1 and to go to it in the middle of the night and grind out tunes for relaxation4 ,he has a working library containing several thousand books4 ,he pores over these volumes to inform himself upon some pressing idea1 and does so in the midst of his work4 ,no man could have made some of his inventions unaided by technical science and a knowledge of the results of the investigations of many others1 and it has often been wondered how a man not technically educated could have seemed so well to know4 ,there was a mistake4 ,he is educated2 a scientific investigator of remarkable attainments4 ,in thinking of the inventions of ,edison and their value1 a dozen of the first class1 that would each one have satisfied the ambition or taken the time of an ordinary man1 can be named4 ,the mimeograph and the electric pen are minor4 ,then there are the stock printer1 the automatic repeating telegraph1 quadruplex telegraphy1 the phono-plex1 the ore-milling process1 the railway telegraph1 the electric engine1 the phonograph4 ,some of these inventions seem1 in the glow of his incandescent light1 or with one's ear to the tube of the telephone he improved in its most essential part1 to be too small for ,edison4 ,but nothing was too small for ,franklin1 or for the boy who played idly with the lid of his mother's tea-kettle and almost invented the steam-engine of today1 or for ,hero of ,alexandria1 who dreamed a thousand years before its time of the power that was to come4 ,so was ,henry's first electric telegraph the merest toy1 and his electro-magnet was supported upon a pile of books1 his signal bell was that with which one calls a servant1 and his idea was a mere experiment without result4 ,there was a boy ,edison needed there then1 whose toys reap fortunes and light1 and enlighten1 the world4 ,the electric pen was in its day immensely useful in the business world1 because it was the application of the stencil to ordinary manuscript1 and caused the making of hundreds of copies upon the stencil idea1 and with a printer's roller instead of a brush4 ,the mimeograph was the same idea in a totally different form4 ,it was writing upon a tablet that is like a bastard-file1 with a steel-pointed stylus4 ,each slight projection makes a hole in the paper1 and then the stencil idea begins again4 ,something has been previously said of the difficulties attending the making of the filament for the incandescent light4 ,it is a little thing1 smaller than a thread1 frail1 delicate1 sealed in a bulb almost absolutely exhausted of air1 smooth without a flaw1 of absolutely even caliber from end to end4 ,the world was searched for substances out of which to make it1 and experiments were endlessly and tediously tried2 all for this one little part of a great invention1 which1 like all other inventions1 would be valueless in the want of a single little part4 ,there are hundreds1 an unknown number1 of inventions in electricity in this country whose authors are unknown1 and will never be known to the general public4 ,the patent office shows many thousands of such in the aggregate4 ,many useful improvements in the telephone alone have come under the eye of every casual reader of the newspapers4 ,these are now locked up from the world1 with many other patented changes in existing machines1 because of the great expense attending their substitution for those arrangements now in use4 ,all the principles--the principles that1 finally demonstrated1 become laws--upon which electrical invention is based1 are old4 ,it seems impossible1 during the entire era of modern thought1 to have found a new trait1 a development1 a hitherto unsuspected quality4 ,tesla1 in some of his most wonderful experiments1 seems almost to have touched the boundaries of an unexplored realm1 yet not quite1 not yet1 and most likely absolute discovery can no farther go4 ,to play upon those known laws--to twist them to new utilities and give them new developments--has been the work of the creators of all the modern electrical miracles4 ,there is scarcely a field in which men work in which the results are not more apparent1 yet all we have1 and undoubtedly most we shall ever have1 of electricity we shall continue to owe to the infant period of the science4 ,it may be truthfully claimed that most of these extraordinary applications of electricity have been made by ,american inventors4 ,wherever there is steam1 on sea or land1 there1 intimately associated with ,american management1 will be found the dynamic current and all its uses4 ,the science of explosive destruction has almost entirely changed1 and with a most extraordinary result4 ,but one of the factors of this change has been the electric current1 a something primarily having nothing to do with guns1 ships or sailing4 ,the modern man-of-war1 beginning with those of our own navy1 is lighted by the electric light1 signalled and controlled by the current1 and her ponderous guns are loaded1 fired1 and even sighted by the same means4 ,her officers are a corps of electrical experts4 ,a large part of her crew are trained to manipulate wires instead of ropes1 and her total efficiency is perhaps three times what it would be with the same tonnage under the old rgime4 ,there is a new sea life and sea science1 born full grown within ten years from a service encrusted with traditions like barnacles1 and that could not have come by any other agency4 ,a big gun is no longer merely that1 but also an electrical machine1 often with machinery as complicated as that of a chronometer and much more mysterious in operation4 ,i have said that the huge piece was even sighted by electricity4 ,there is really nothing strange in the statement1 though it may read like a fairy tale or a metaphor to whoever has never had his attention called to the subject4 ,in a small way1 with the name of its inventor almost unknown except to his messmates1 it is one of the most wonderful1 and one of the simplest1 of the modern miracles4 ,as a mere instance of the wide extent of modern ideas of utility1 and of the possibilities of application of the laws that were discovered and formulated by those whose names the units of electrical measurements bear1 it may be briefly stated how a group of gunners may work behind an iron breastwork1 and never see the enemy's hull1 and yet aim at him with a hundred times the accuracy possible in the day of the ,old ,ironsides and the ,guerriere4 ,and first it may be stated that the range-finder is largely a measure of mere economy4 ,a two-million-dollar cruiser is not sailed1 or lost1 as a mere pastime4 ,whoever aims best will win the fight4 ,ten years ago the way of finding distance1 or range1 which is the same thing1 was experimental4 ,if a costly shot was fired over the enemy the next one was fired lower1 and possibly between the two the range might be got1 both vessels meantime changing positions and range4 ,to change this1 to either injure an antagonist quickly or get away1 the range-finder was invented1 as a matter not of business profit1 by ,lieutenant ,bradley ,a4 ,fiske1 of the ,u4 ,s4 ,navy1 in #ahhi4 ,it has its reason in the familiar mathematical proposition that if two angles and one side of a triangle are known1 the other sides of the triangle are easily found4 ,that is1 that it can be determined how far it is to a distant object without going to it4 ,but ,fiske's range-finder makes no mathematical calculations1 nor requires them to be made1 and is automatic4 ,a base line permanently fixed on the ship is the one side of a triangle required4 ,the distance of the object to be hit is determined by its being the apex of an imaginary triangle1 and at each of the other angles1 at the two ends of the base line1 is fixed a spyglass4 ,these are directed at the object4 ,so far electricity has had nothing to do with the arrangement1 but now it enters as the factor without which the device could have no adaptation4 ,as the telescopes are turned to bear upon the target they move upon slides or wires bent into an arc1 and these carry an electric current4 ,the difference in length of the slide passed over in turning the telescopes upon the object causes a greater or less resistance to the current1 precisely as a short wire carries a current more easily2 with less resistance2 than a long one4 ,a contrivance for measuring the current1 amounting to the same thing that other instruments do of the same class that are used every day1 allows of this resistance being measured and read1 not now in units of electricity1 but in distance to the apex of the triangle where the target is2 in yards4 ,the man at each telescope has only to keep it pointed at the target as it moves1 or as the vessel moves which wishes to hit it4 ,and now even the telephone enters into the arrangement4 ,elsewhere in the ship another man may stand with the transmitter at his ear4 ,he will hear a buzzing sound until the telescopes stop moving1 and at the same time there will be under his eye a pointer moving over a graduated scale4 ,the instant the sound ceases he reads the range denoted by the index and scale4 ,the information is then conveyed in any desired way to the men at the guns2 these1 of course1 being aimed by a scale corresponding to that under the eye of the man at the telephone4 ,the plan is not here detailed as technical information valuable to the casual reader1 but as showing the wide range of electrical applications in fields where possible usefulness would not have been so much as suspected a few years ago4 ,the same gentleman1 ,lieut4 ,fiske1 is also the author of ingenious electrical appliances for the working of those immense gun-carriages that have grown too big for men to move1 and for the hoisting into their cavernous breeches of shot and shell4 ,the men who work these guns now do not need to see the enemy1 even through the porthole or the embrasure4 ,they can attend strictly to the business of loading and firing1 assisted by machines nearly or quite automatic1 and can cant and lay the piece by an index1 and fire with an electric lanyard4 ,the genius of science has taken the throne vacated by the goddess of glory4 ,the sailor has gone1 and the expert mechanician has taken his place4 ,the tar and his training have given way to the register1 the gauge and the electrometer4 ,the big black guns are no longer run backward amid shouts and flying splinters1 and rammed by men stripped to the waist and shrouded in the smoke of the last discharge1 but swing their long and tapering muzzles to and fro out of steel casemates1 and tilt their ponderous breeches like huge grotesque animals lying down4 ,the grim machinery of naval battle is moved by invisible hands1 and its enormous weight is swayed and tilted by a concealed and silent wire4 ,this strange slave1 that toils unmoved in the din of battle1 has been reduced to domestic servitude of the plainest character4 ,the demonstrations made of cooking by electricity at the great fair of #ahic leave that service possible in the future without any question4 ,electrical ovens1 models of neatness1 convenience and coolness1 were shown at work4 ,they were made of wood1 lined with asbestos1 and were lighted inside with an incandescent lamp4 ,the degree of temperature was shown by a thermometer1 and mica doors rendered the baking or roasting visible4 ,there could be no question of too much heat on one side and too little on another1 because switches placed at different points allowed of a cutting off1 or a turning on1 whenever needed4 ,laundry irons had an insulated pliable connection attached1 so that heat was high and constant at the bottom of the iron and not elsewhere4 ,there were all the appliances necessary for the broiling of steaks1 the making of coffee and the baking of cakes1 and the same mystery1 which is no longer a mystery1 pervaded it all4 ,woman is also to become an electrician1 at least empirically1 and in time soon to come will understand her voltage and her ,ampres as she now does her drafts and dampers and the quality of her fuel4 ,it is a practical fact that chickens are hatched by the thousand by the electrical current1 and that men have discovered more than nature knew about the period of incubation1 and have reduced it by electricity from twenty-one to nineteen days4 ,the proverb about the value of the time of the incubating hen has passed into antiquity with all things else in the presence of electrical science4 ,whenever an ,american mechanician1 a manufacturer or an inventor1 is confronted by a difficulty otherwise insolvable he turns to electricity4 ,its laws and qualities are few4 ,they seem now to be nearly all known1 but the great curiosity of modern times is the almost infinite number of applications which these laws and qualities may be made to serve4 ,one may turn at a single glance from the loading and firing of naval guns to the hatching of chickens and the cooking of chocolate by precisely the same means1 silently used in the same way4 ,most of these applications1 and all the most extraordinary ones1 are of ,american origin4 ,their inventors are largely unknown4 ,there is no attempt made here to more than suggest the possibilities of the near future by a glimpse of the present4 ,the generation that is rising1 the boy who is ten years old1 should easily know more of electrical science than ,franklin did4 ,there are certain primal laws by which all explanations of all that now is1 and most probably of almost all that is to come so far as principles go1 may be readily understood1 and these ,i have endeavored1 in this and preceding chapters1 to explain4 ,there are in the ,united ,states new applications of electricity literally every day4 ,before the written page is printed some startling application is likely to be made that gives to that page at once an incompleteness it is impossible to guard against or avoid4 ,there is a strong inclination to prophesy2 to tell of that which is to come2 to picture the warmed and illuminated future1 smokeless and odorless1 and the homes in which the children of the near future shall be reared4 ,some of those few apprehended things1 suggested as being possible or desirable in these chapters1 have been since done and the author has seen them4 ,this ,american facility of electrical invention has one great cause1 one specific reason for its fruitfulness4 ,it is because so many acute minds have mastered the simple laws of electrical action4 ,this knowledge not only fosters intelligent and fruitful experiment but it prevents the doing of foolish things4 ,no man who has acquired a knowledge of mechanical forces1 who understands at least that great law that for all force exerted there is exacted an equivalent1 ever dreams upon the folly of the perpetual motion4 ,in like manner does a knowledge1 purely theoretical1 of the laws of electricity prevent that waste of time in gropings and dreams of which the story of science and the long human struggle in all ages and in all departments is full4 ,finally1 ,i would1 if possible dispell all ideas of strangeness and mystery and semi-miracle as connected with electrical phenomena4 ,there is no mystery2 above all1 there is no caprice4 ,there are1 in electricity and in all other departments of science1 still many things undiscovered4 ,it is certain that causes lead far back into that realm which is beyond present human investigation4 ,force has innumerable manifestations that are visible1 that are understood1 that are controlled4 ,its origin is behind the veil4 ,a thousand branching threads of argument may be taken up and woven into the single strand that leads into the unknown4 ,out of the thought that is born of things has already arisen a new conception of the universe1 and of the ,eternal ,mind who is its master4 ,among these things1 these daily manifestations of a seeming mystery1 the most splendid are the phenomena of electricity4 ,they court the human understanding and offer a continual challenge to that faculty which alone distinguishes humanity from the beasts4 ,the assistance given in the preceding pages toward a clear understanding of the reason why1 so far as known1 is perhaps inadequate1 but is an attempt offered for what of interest or value may be found4