Definition of Heliograph
a device for telegraphing that uses sun's rays flashed from a mirror to send signals
Examples of Heliograph in a sentence
During the 19th century, a heliograph was traditionally used to send sun-based signals over long distances.
Pivoting the mirror in the light, the solider was able to send a signal using the heliograph.
The heliograph was a simple telegraph machine that only needed a mirror and sun rays to function.
A heliograph was standard issue for many early 20th century militaries as it was used as a solar based communication device.
Though the mirror like heliograph was a great way to communicate during the day time, because it requires sunlight it could not be used to message at night.
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