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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.





WordNet 3.0 © 2010 Princeton University


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"Heliograph" Quotes from Famous Books



... is had by the use of the telephone and the radio or wireless telephone. Signalling by means of the heliograph is practiced on bright days in regions that have no telephones. Arrangements made with private telephone companies permit the forest officers to use their lines. The efficient communication systems aid in ...
— The School Book of Forestry • Charles Lathrop Pack


Words linked to "Heliograph" :   sign, signal, apparatus, signalize, setup, signalise


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