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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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heliograph (disambiguation)」の詳細全文を読む スポンサード リンク
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