heliograph : Definition, Usages, News and More

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heliograph


  • n  an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
  • v  signal by means of a mirror and the using the sun's rays

  • In the flash of heliograph signals in the North Sea haze and the speaking of great naval guns, the world has lately read a certain statement about the British Empire.

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