Heliograph, c1900
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Heliograph, c1900
Heliograph, c1900. The Heliograph, a visual telegraph for sending and receiving messages by means of mirrors and sunlight. Here a British signal unit in tropical kit is flashing a message to the fort in the distance. Trade card for Liebig Meat Extract
Media ID 14835858
© Ann Ronan Picture Library / Heritage-Images
Chromolithograph Distance Distant Fort Innovation Military Personnel Mirror Palm Tree Signal Signalling Signalling Post Telegraphy Tropical Tropics
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