Semaphore
Traditionally, a semaphore was an apparatus featuring colored lights and mechanical arms, which allowed for simple visual signals to be conveyed from a distance. Such a device was used, for ...
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Semaphore
To meet the need for swift communication between Napoleon's (1769-1821) far-flung armies in the 1790s, the Frenchman Claude Chappe (1763-1805) invented an optical-relay system of visual tele...
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Semaphore
Semaphore