Chappe telegraph system. Demonstration, in 1791, of the telegraph system of the brothers Chappe. This early telegraph sent messages quickly over long
Chappe telegraph system. Demonstration, in 1791, of the telegraph system of the brothers Chappe. This early telegraph sent messages quickly over long distances. On 2 March 1791, the brothers transmitted a message from Brulon (16 kilometres away, centre left) to an identical set-up at Parce (foreground). A system of pendulum weights rotated a pointer on a clock face at each location. Flipping a large black and white card synchronised the pointers and transmissions. A group of officials watched the demonstration. Artwork from 'Electricite' (1911) by Max de Nansouty, part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.
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