HELIOGRAPH

heliograph

(noun) an apparatus for sending telegraphic messages by using a mirror to turn the sun’s rays off and on

heliograph

(verb) signal by means of a mirror and the using the sun’s rays

Source: WordNet® 3.1

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Etymology

Noun

heliograph (plural heliographs)

An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.

A heliogram.

An instrument for measuring the intensity of sunlight.

A device for photographing the sun.

(obsolete) A photograph.

Verb

heliograph (third-person singular simple present heliographs, present participle heliographing, simple past and past participle heliographed)

(transitive) To send a message by heliograph.

(intransitive) To send a heliograph.

(transitive, dated) To photograph by sunlight.

Source: Wiktionary

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He"li*o*graph, n. Etym: [Helio- + -graph.]

1. A picture taken by heliography; a photograph.

2. An instrument for taking photographs of the sun.

3. An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.

Source: Webster’s Unabridged Dictionary 1913 Edition

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