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
Frequently asked questions for heliograph:
How many solutions are there for the crossword clue "HELIOGRAPH"?
There are 48 solutions. The longest is POLICE WHISTLE with 13 letters, and the shortest is MUG with 3 letters.
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