Optical communication

Optical communication

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Optical communication. Historical artwork of a system of communication using a series of torches to indicate letters of the alphabet. This system was described by the Ancient Greek scholar Polybius around 200BC. A system of ten torches and two walls were used to spell out words by their constituent letters according to a grid of coordinates. Two torches on the left and one on the right, as seen, might indicate the letter 'B'. From La Telegraphie Historique by Alexis Belloc (1888).

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Keywords: 1888, 200bc, alexis belloc, antiquity, artwork, classical, code, communicating, communication, communications, drawing, encoded, grecian, greece, greek, historical, history, illustration, la telegraphie historique, optical, painting, polybius, signal, signalling, smoking, technological, technology, telecommunication, telecommunications, telegraphy, torch, torches, visual

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