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heliograph

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.13 sec.
heliograph (hē`lēəgrăf) [Gr.,=sun-writer], signaling device using flashes of sunlight. It has two mirrors that are used to reflect sunlight on a distant point and a shutter through which the sunlight passes so that messages may be transmitted in telegraphic code by means of long and short flashes. It was used in ancient times and as recently as the 19th cent. by the U.S. army in the SW United States and by the British army in India.


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I told him it was the heliograph signalling--that it was the sign of human help and effort in the sky.
The War Of The Worlds by Wells, H.G. View in context
Then a piece of mica, or a little pool, or even a highly-polished leaf will flash like a heliograph.
The Second Jungle Book by Kipling, Rudyard View in context
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