What does heliograph mean?

Looking for the meaning or definition of the word heliograph? Here's what it means.

  1. An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
  2. A heliogram.
  3. An instrument for measuring the intensity of sunlight.
  4. A device for photographing the sun.
  5. (obsolete) A photograph.
  1. (transitive) To send a message by heliograph.
  2. (intransitive) To send a heliograph.
  3. (transitive, dated) To photograph by sunlight.
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