Heliograph - definition, pronunciation, transcription

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Amer.  |ˈhiːlɪəɡræf|  American pronunciation of the word heliograph
Brit.  |ˈhiːlɪə(ʊ)ɡrɑːf|  British pronunciation of the word heliograph

noun

- an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on

verb

- signal by means of a mirror and the using the sun's rays
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