Diy Heliograph
Wall Art and Photo Gifts from Mary Evans Picture Library
Diy Heliograph
A simple heliograph is easily constructed, and uses the suns rays to transmit messages, in morse code, over distances up to 100 kilometres
Media ID 4369061
© Mary Evans Picture Library
1921 Code Constructed Distances Easily Experiments Heliograph Kilometres Messages Morse Rays Simple Transmit
MADE IN THE UK
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