heliograph$34309$ - ορισμός. Τι είναι το heliograph$34309$
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Τι (ποιος) είναι heliograph$34309$ - ορισμός

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         
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.
Heliograph         
·add. ·vt To photograph by sunlight.
II. Heliograph ·noun A picture taken by heliography; a photograph.
III. Heliograph ·noun An instrument for taking photographs of the sun.
IV. Heliograph ·add. ·vt To telegraph, or signal, with a heliograph.
V. Heliograph ·noun An apparatus for telegraphing by means of the sun's rays. ·see Heliotrope, 3.
Heliograph         
A heliograph ( They then turned up the sighting vane, which covered the cross wires with a diagram of a cross, and aligned the mirror with the tangent and elevation screws so the small shadow that was the reflection of the unsilvered spot hole was on the cross target. This indicated that the sunbeam was pointing at the target.

Βικιπαίδεια

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.