Herman Hollerith
Herman Hollerith (29 February 1860 – 17 November 1929) was an American statistician and inventor whose punched-card tabulating machine processed the 1890 US census — the moment punched cards moved from controlling looms to processing data, and the seed from which IBM grew.
The census problem
The US Constitution demands a census every ten years — and the 1880 count took nearly a decade to process by hand, finishing just in time to start the next one. Hollerith, a Columbia-trained engineer who had worked on that census, saw the wall approaching: the 1890 census would overflow a decade.
His solution encoded each person's answers as holes in a card at fixed positions — age, sex, occupation, birthplace — and ran the cards through a tabulator whose spring pins dipped into mercury cups wherever a hole let them through, closing a circuit and clicking a counter dial. Clerks could also sort cards mechanically into bins. The machine did not compute like a computer; it counted and sorted — the dawn of data processing.
The 1890 census was tabulated in about two and a half years — years ahead of schedule — and Hollerith won contracts across the United States and abroad.
From Tabulating Machine Company to IBM
In 1896 Hollerith founded the Tabulating Machine Company, leasing machines and — crucially — selling cards by the million. The business model (machines plus consumable cards) made the company durable, and in 1911 it merged with three others into the Computing-Tabulating-Recording Company. In 1924 CTR was renamed International Business Machines — IBM.
IBM's 80-column card, introduced in 1928, became the worldwide standard that carried punched cards through the entire mainframe era — the card format FORTRAN programmers punched statements onto until the 1970s.
Legacy
- Hollerith's machine is why "information processing" exists as an industry at all — governments and railways had data long before they had computers, and his tabulator was the bridge.
- The card fields, the counting dials, and the machine-readable record all descend from his census work — and the medium itself from the Jacquard loom's instruction decks.
- He won a Columbia doctorate for the tabulator, retired to a farm in Maryland, and lived to see his company become IBM — the rare inventor who profited from a genuinely foundational idea.
See also
References
- Austrian, Geoffrey D. Herman Hollerith: Forgotten Giant of Information Processing (Columbia UP, 1982).
- U.S. Census Bureau. Hollerith 1890 Census Tabulator — bureau history archives.
- Truesdell, Leon E. The Development of Punch Card Tabulation in the Bureau of the Census (GPO, 1965).