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The first telegraphs where optical, including the use of smoke signals and beacons, already in ancient times. The electrical telegraph was invented in the 1830s by Samuel Morse, who also developed the Morse code signalling alphabet, and quickly deployed in the following two decades. Nikola Tesla showed the usefulness of wireless telegraphy or radio. |
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The first telegraphs were optical, including the use of smoke signals and beacons, and were already present in ancient times. An electrical telegraph invented in the 1830s by Samuel Morse, who also developed the Morse code signalling alphabet, was quickly deployed in the following two decades. Nikola Tesla and other scientists and inventors showed the usefulness of wireless telegraphy, or radio, beginning in the 1860s. |
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