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Τι (ποιος) είναι HELIOGRAPH - ορισμός

COMMUNICATION DEVICE REFLECTING SUNLIGHT

Solar signal; Heliograph (messaging)

heliograph

¦ noun

1. a signalling device by which sunlight is reflected in flashes from a movable mirror.

a message sent by heliograph; a heliogram.

2. a telescopic apparatus for photographing the sun.

3. historical a type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish.

¦ verb

1. send (a message) by heliograph.

2. take a heliographic photograph of.

Derivatives

heliographic adjective

heliography noun

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.

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.

https://en.wikipedia.org/wiki/Heliograph