Picture No | 10193590 |
Date | 1921 |
Description | Diy Heliograph |
Details |
A simple heliograph is easily constructed, and uses the sun's rays to transmit messages, in morse code, over distances up to 100 kilometres.
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Source | Liebig card in series 1116 'Curieuses experiences de physique' issued in 1921 4 of 6 |
Credit | Mary Evans Picture Library |
Restrictions |
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