Check the listing for details. Sun Signal Heliograph 1964 HowTo Build PLANS sends morse code. Condition: Used. Listed at 8.99 USD. “How to Make a Heliograph”. Plans for a Heliograph. This Sun Signal can be used to send Morse code signals as far as the eye can see. & Plans from a Bygone Era. Discover a Wealth of How-to Projects.
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