The Ancestors of Sms

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In the heart of Saverne stands a mysterious tower surmounted by a semaphore: it is the Chappe telegraph. Cables and pulleys operate articulated arms. Each figure is a signal that corresponds to a secret code traveling from one tower to the next thanks to its long-views. It is then sufficient to check whether, fifteen kilometers from there, your colleague reproduces the same figure. In 1852, the Chappe telegraph network had 550 stations and conne…