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This is to be distinguished from semaphore, which merely transmits messages.

A cablegram was a message sent by a submarine telegraph cable, often shortened to a cable or a wire.

Later, a Telex was a message sent by a Telex network, a switched network of teleprinters similar to a telephone network.

The first telegraphs came in the form of optical telegraph, including the use of smoke signals, beacons, or reflected light, which have existed since ancient times.

Early proposals for an optical telegraph system were made to the Royal Society by Robert Hooke in 1684 During 1790–1795, at the height of the French Revolution, France needed a swift and reliable communication system to thwart the war efforts of its enemies.

The first means used a combination of black and white panels, clocks, telescopes, and codebooks to send their message.

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