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Wireless Telegraphy and Telephony Simply Explained ⠃⠗⠋ braille edition

Grade 2 — contracted English braille (EBAE-compatible subset). Translated on this server by our own braille engine (BRF — Braille Ready Format, Library of Congress fdd000551). View Grade 1 instead.

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237,012 braille cells · 251 embossed pages at 40×25 · 686 unrepresentable characters omitted

⠉⠁⠇⠇⠀⠷⠀⠮⠀⠇⠯⠀⠌⠁⠞⠊⠕⠝⠀⠀⠔⠀⠹⠊⠎⠀⠉⠁⠎⠑⠀⠊⠎⠀⠠⠝⠲⠀
⠠⠽⠲⠂⠀⠯⠀⠞⠀⠷⠀⠮⠀⠌⠑⠁⠍⠻⠂⠀⠠⠚⠲⠀⠠⠓⠲⠀⠀⠀⠀
⠠⠊⠇⠇⠥⠌⠗⠁⠞⠊⠕⠝⠒⠀⠠⠠⠋⠊⠛⠲⠀⠼⠁⠁⠑⠲⠤⠤⠰⠠⠉⠕⠝⠞⠔⠢⠞⠁⠇⠀
⠉⠕⠙⠑⠲⠀⠀⠀⠀⠠⠔⠀⠕⠗⠙⠻⠀⠞⠕⠀⠎⠢⠙⠀⠮⠀⠍⠑⠎⠎⠁⠛⠑⠀⠞⠕⠀⠮⠀
⠩⠊⠏⠂⠀⠠⠝⠲⠀⠠⠽⠲⠀⠹⠗⠪⠎⠀⠮⠀⠁⠻⠊⠁⠇⠀⠊⠝⠞⠕⠀⠀⠏⠕⠎⠊⠞⠊⠕⠝
⠀⠿⠀⠎⠢⠙⠬⠲⠀⠠⠹⠊⠎⠀⠁⠉⠞⠀⠁⠇⠎⠕⠀⠌⠜⠞⠎⠀⠮⠀⠍⠕⠞⠕⠗⠀
⠛⠢⠻⠁⠞⠕⠗⠀⠎⠑⠞⠀⠀⠎⠥⠏⠏⠇⠽⠬⠀⠉⠥⠗⠗⠢⠞⠀⠞⠕⠀⠮⠀
⠞⠗⠁⠝⠎⠿⠍⠻⠲⠀⠠⠏⠗⠑⠎⠎⠬⠀⠮⠀⠅⠑⠽⠂⠀⠮⠀⠕⠏⠻⠁⠞⠕⠗⠀⠀⠮⠝⠀
⠎⠊⠛⠝⠁⠇⠎⠀⠔⠀⠮⠀⠞⠑⠇⠑⠛⠗⠁⠏⠓⠀⠉⠕⠙⠑⠀⠠⠚⠲⠀⠠⠓⠲⠂⠀⠠⠚⠲⠀
⠠⠓⠲⠂⠀⠠⠚⠲⠀⠠⠓⠲⠤⠤⠠⠍⠲⠀⠠⠎⠲⠀⠠⠛⠲⠤⠠⠝⠲⠀⠀⠠⠽⠲⠤⠤⠯⠀
⠛⠊⠧⠑⠎⠀⠮⠀⠋⠔⠊⠩⠀⠎⠊⠛⠝⠁⠇⠲⠀⠠⠍⠲⠀⠠⠎⠲⠀⠠⠛⠲⠀⠊⠎⠀⠮⠀
⠁⠃⠃⠗⠑⠧⠊⠁⠞⠊⠕⠝⠀⠿⠀⠀⠍⠑⠎⠎⠁⠛⠑⠲⠀⠠⠮⠀⠠⠝⠲⠀⠠⠽⠲⠀
⠕⠏⠻⠁⠞⠕⠗⠀⠮⠝⠀⠹⠗⠪⠎⠀⠦⠀⠎⠺⠊⠞⠡⠀⠃⠁⠉⠅⠀⠊⠝⠞⠕⠀⠮⠀⠀
⠗⠑⠉⠑⠊⠧⠬⠀⠏⠕⠎⠊⠞⠊⠕⠝⠀⠯⠀⠺⠁⠊⠞⠎⠀⠿⠀⠁⠀⠗⠑⠏⠇⠽⠲⠀⠠⠊⠋⠀
⠐⠕⠀⠊⠎⠀⠝⠀⠿⠹⠉⠕⠍⠬⠀⠀⠩⠕⠗⠞⠇⠽⠀⠮⠀⠉⠁⠇⠇⠬⠀⠏⠗⠕⠉⠑⠎⠎⠀
⠊⠎⠀⠗⠑⠏⠑⠁⠞⠫⠲⠀⠀⠀⠀⠠⠊⠇⠇⠥⠌⠗⠁⠞⠊⠕⠝⠒⠀⠠⠠⠋⠊⠛⠲⠀
⠼⠁⠁⠋⠲⠤⠤⠠⠞⠗⠁⠝⠎⠍⠊⠞⠞⠬⠀⠑⠟⠥⠊⠏⠍⠢⠞⠀⠷⠀⠮⠀⠓⠊⠛⠓⠀⠏⠪⠻
⠀⠀⠌⠁⠞⠊⠕⠝⠀⠁⠞⠀⠠⠝⠁⠥⠢⠂⠀⠞⠺⠢⠞⠽⠤⠋⠊⠧⠑⠀⠍⠊⠇⠑⠎⠀
⠝⠕⠗⠹⠺⠑⠌⠀⠷⠀⠠⠃⠻⠇⠔⠂⠀⠠⠛⠻⠍⠁⠝⠽⠂⠀⠀⠩⠪⠬⠀⠎⠊⠭⠀
⠊⠝⠙⠥⠉⠞⠊⠕⠝⠀⠉⠕⠊⠇⠎⠀⠶⠔⠀⠮⠀⠿⠑⠛⠗⠳⠝⠙⠶⠀⠁⠗⠗⠁⠝⠛⠫⠀⠞⠕
⠀⠡⠜⠛⠑⠀⠀⠮⠀⠠⠇⠑⠽⠙⠢⠀⠚⠜⠎⠀⠶⠉⠕⠍⠏⠕⠎⠫⠀⠷⠀⠼⠉⠋⠚⠀
⠥⠝⠊⠞⠎⠶⠲⠀⠀⠀⠀⠠⠊⠇⠇⠥⠌⠗⠁⠞⠊⠕⠝⠒⠀⠠⠠⠋⠊⠛⠲⠀
⠼⠁⠁⠛⠲⠤⠤⠰⠠⠙⠥⠏⠇⠑⠭⠀⠗⠑⠉⠑⠊⠧⠬⠀⠁⠏⠏⠜⠁⠞⠥⠎⠲⠀⠠⠮⠀⠎⠑⠞
⠀⠞⠕⠀⠀⠮⠀⠇⠑⠋⠞⠀⠍⠁⠽⠀⠃⠑⠀⠁⠙⠚⠥⠌⠫⠀⠞⠕⠀⠗⠑⠉⠑⠊⠧⠑⠀
⠩⠕⠗⠞⠀⠺⠁⠧⠑⠀⠇⠢⠛⠹⠎⠀⠯⠀⠞⠀⠞⠕⠀⠀⠮⠀⠐⠗⠀⠞⠕⠀⠗⠑⠉⠑⠊⠧⠑⠀

These are the same pages the .brf download embosses — form-feed breaks and all. BRF opens in braille software (Duxbury, BrailleBlaster), on embossers, and on refreshable displays.