Claude Chappe (1763 – 1805) French inventor who in 1792 demonstrated a practical semaphore system that eventually spanned all of France.


His system consisted of a series of towers, each within line of sight of others, each supporting a wooden mast with two crossarms on pivots that could be placed in various positions. The operator in a tower moved the arms to a sequence of positions, spelling out text messages in semaphore code.


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