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Heliograph   Listen
Heliograph

noun
1.
An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on.





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"Heliograph" Quotes from Famous Books



... advances in the art of war, have been invented in time of peace. There are some improvements so obvious, and at the same time so valuable, that it is extraordinary that they were not adopted. Signalling, for example, whether by heliograph or by flag-waving, would have made an immense difference in the Napoleonic campaigns. The principle of the semaphore was well known, and Belgium, with its numerous windmills, would seem to be furnished with ...
— Through the Magic Door • Arthur Conan Doyle
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Words linked to "Heliograph" :   setup, apparatus, signal, signalize, sign, signalise


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