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1. (n.) heliograph
a device for signaling or sending messages by means of a movable mirror that reflects beams of light, esp. sunlight, over a distance.
2. heliograph
an instrument for photographing the sun, consisting of a camera and specially adapted telescope.
3. (v.i.) heliograph
to communicate by heliograph.
Etymology: (1815–25)
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| Definition of 'heliograph' |
Princeton's WordNet |
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1. (verb) heliograph
an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
2. (verb) heliograph
signal by means of a mirror and the using the sun's rays
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| Definition of 'heliograph' |
Webster Dictionary |
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1. (noun) heliograph
a picture taken by heliography; a photograph
2. (noun) heliograph
an instrument for taking photographs of the sun
3. (noun) heliograph
an apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3
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| Definition of 'heliograph' |
The Standard Electrical Dictionary |
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1. heliograph
An apparatus for reflecting flashes of light to a distant observer. By using the Morse telegraph code messages may thus be transmitted long distances. When possible the sun's light is used.
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Definitions of heliograph 
