The Secret Life of Machines: The Telephone

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The Secret Life of Machines: The Telephone
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From: silichip
Videos: 2016
Added: 27-10-2011 00:56:59
Classic: S02E04 (1991) - The forerunner of the telephone was the telegraph. By 1870 all major towns in Europe and America had telegraphs, sending messages in 'on' and 'off' pulses (e.g. Morse code). It was while trying to improve the telegraph that Bell discovered the telephone.
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