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heliograph |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.06 sec. |
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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. heliograph 1. an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays 2. a device used to photograph the sun heliograph [′hē·lē·ə‚graf] (communications) An instrument for sending telegraphic messages by reflecting the sun's rays from a mirror. (engineering) An instrument that records the duration of sunshine and gives a qualitative measure of its amount by action of sun's rays on blueprint paper. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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. Then a piece of mica, or a little pool, or even a highly-polished leaf will flash like a heliograph. |
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