Heliograph (disambiguation)

Heliograph (disambiguation)

Heliograph is a word derived from "helios" (Greek Ἥλιος / ἥλιος "sun") and "graphein" (γραφειν "to write"). It has several uses:
* the heliograph, a device used for optical signalling
* a type of sunshine recorder
* a solar telescope, a telescope especially adapted for viewing the surface of the sun (obsolete).
* a camera especially adapted for photographing the sun; also called a "photoheliograph" (obsolete).


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