Definitions from Wiktionary (heliograph)

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






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