Heliograph
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A heliograph is a solar telegraph system that signals by flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shut
Fig. 1: Signaling with a Mance heliograph; Alaska–Canada border, 1910.
Fig. 2: A German heliograph made by R. Fuess in Berlin, on display at the Museum of Communication in Frankfurt
Fig. 3 A Turkish / Ottoman Empire heliograph military crew at Huj during the First World War, 1917
Fig. 4: A U.S. Army Signal Corps heliograph instrument, 1898
Signal lamp
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A signal lamp is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice b
Heliograph
…terrain and climate, as well as the nature of the campaign, made heliography a logical choice. For night communications, the British used some large signal lamps, brought inland on railroad cars, and equipped with leaf-type shutters for keying a beam of light into dots and dashes. During the early stages of the…
Signal lamp training during World War II
Begbie signalling oil lamp, 1918
An air traffic controller using a handheld Aldis lamp to signal a plane to land.