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    https://en.wikipedia.org › wiki › Optical_telegraph

    Optical telegraph - Wikipedia

    • Ta' Kenuna Tower, a semaphore tower in Nadur, Gozo, Malta, built by the British in 1848. The British military authorities began to consider installing a semaphore line in Malta in the early 1840s. Initially, it was planned that semaphore stations be established on the bell towers and domes of the island's churches, but the religious authorities ...… 展开

    Overview

    An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical communication). There are two main types of such systems… 展开

    Etymology and terminology

    The word semaphore was coined in 1801 by the French inventor of the semaphore line itself, Claude Chappe. He composed it from the Greek elements σῆμα (sêma, "sign"); and from φορός (phorós, "carrying"), or φο… 展开

    Early designs

    Optical telegraphy dates from ancient times, in the form of hydraulic telegraphs, torches (as used by ancient cultures since the discovery of fire) and smoke signals. Modern designs of semaphores developed via several paths… 展开

    How did semaphore signalling work?
    Illustration of signalling by semaphore in 18th-century France. The operators would move the semaphore arms to successive positions to spell out text messages in semaphore code, and the people in the next tower would read them.
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