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| | 2. The Electric Telegraph (1860-1914) |
 | | However, visual telegraphs were slow, covered limited distances, and were usable only during good visibility, so inventors worked to develop a way to send signals by electrical currents along wires, which promised nearly instantaneous transmissions over great distances in all kinds of weather. |
 | | Although the electric telegraph made most visual telegraphs obsolete, telegraph wires couldn't be run out to sea, so, until the development of radio, a few semaphore links continued to provide ship-to-shore communication. |
 | | Telegraphic Codes, from the 1912 edition of the Electro-Importing Company's Wireless Course, compares the American and Continental Morse Codes with a third, short-lived code used by the U.S. Navy. |
| www.earlyradiohistory.us /sec002.htm (1604 words) |
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