SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Communication tower. Historical artwork of a Roman communication tower with a lit torch. This was a form of optical telegraphy that used smoke signals by day, and torchlight by night. Successive towers could be used to transmit a signal across long distances. This drawing was based on a carving on Trajan's column in Rome. Trajan's column was constructed from AD106-113 and depicts the conquests of Emperor Trajan. From La Telegraphie Historique by Alexis Belloc (1888).
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