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Heliograph1917

The heliograph was a Charisian innovation, that used reflected sunlight to transmit messages in what was known on Old Earth as Morse code. The heliograph is described as having a lever on the side, and shutters, which implies a system similar to the Old Earth American heliograph depicted at right) rather than the better known Old Earth Mance heliograph, that used a rocking mirror rather than a shutter.(BHD)