Comments on: This Day in Geek History: January 17

By: This Day in Geek History: January 17 | The Black Ball

This Day in Geek History: January 17 | The Black Ball — Sat, 17 Jan 2009 08:15:05 +0000

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This Day in Geek History: January 17 — Sat, 17 Jan 2009 07:41:02 +0000

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By: This Day in Geek History: January 17

This Day in Geek History: January 17 — Sat, 17 Jan 2009 07:24:16 +0000

[...] Random Feed wrote an interesting post today onHere’s a quick excerpt1882 Leroy B. Firman receives the first patent for a telephone switchboard. (U.S. No. 252,576 ) The invention will play a fundamental role in the success of the telephone industry. Thomas Alva Edison is issued a patent for the carbon microphone for the telephone. (US No. 252,442) The microphone consists of a conducting material, such as carbon, held between metal cups or rings attached to the telephone mouthpiece’s diaphragm. Sound waves cause the diaphragm to change the pressure on the carbo [...]