heliograph

Noun
  1. An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on (synset 103517596)
    is a type of: apparatus, setup - equipment designed to serve a specific function
Verb
  1. Signal by means of a mirror and the using the sun's rays (synset 201042272)
    is a type of: sign, signal, signalise, signalize - communicate silently and non-verbally by signals or signs

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