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).
• heliography, the photographic process used to make the earliest known permanent photograph from nature