COOKE & WHEATSTONE TELEGRAPH
William Cooke and Sir Charles Wheatstone patented a 5-needle telegraph in 1837. They used the principle of electromagnetism to turn five arrows, similar to a galvanometer, as it was known at the time. Two arrows would be moved at the same time to point at a letter of the alphabet, displayed on a diamond-shaped board. The sender and receiver equipment were identical and connected by five wires.
I built a model of the Cooke & Wheatstone telegraph, using five small servomotors and a microcontroller.
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