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Defenition of the word heliograph

    • Defenition of the word heliograph

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

    Hypernyms for the word heliograph

      • apparatus
      • setup
      • sign
      • signal
      • signalise
      • signalize

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