heliograph$34309$ - traduzione in greco
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heliograph$34309$ - traduzione in greco

COMMUNICATION DEVICE REFLECTING SUNLIGHT
Solar signal; Heliograph (messaging)
  • British troops training with a heliograph, Egypt, June 1940
  • Fig. 1: Signaling with a Mance heliograph, Alaska-Canada border, 1910.
  • Ruins of German Schutztruppe on top of [[Dikwillem]], where the Germans used to have a Heliographic Station (Bird's eye view 2017)
  • Huj]] during World War I, 1917

heliograph      
n. ηλιογράφος

Definizione

Heliograph
An apparatus for reflecting flashes of light to a distant observer. By using the Morse telegraph code messages may thus be transmitted long distances. When possible the sun's light is used.

Wikipedia

Heliograph

A heliograph (from Ancient Greek ἥλιος (hḗlios) 'sun', and γράφειν (gráphein) 'to write') is a solar telegraph system that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter. The heliograph was a simple but effective instrument for instantaneous optical communication over long distances during the late 19th and early 20th century. Its main uses were military, survey and forest protection work. Heliographs were standard issue in the British and Australian armies until the 1960s, and were used by the Pakistani army as late as 1975.