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Hydraulic telegraph
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A hydraulic telegraph refers to two different semaphore systems involving the use of water-based mechanisms as a telegraph. The earliest one was developed in 4th-century BC Greece, while the other was
An ancient hydraulic telegraph being used by Aeneas to send a message.
An ancient hydraulic telegraph being used by Aeneas to send a message.
Reconstruction, Thessaloniki Science Center and Technology Museum
Reconstruction, Thessaloniki Science Center and Technology Museum
Reconstructed model, messages attached to rod, Thessaloniki Science Center and Technology Museum
Reconstructed model, messages attached to rod, Thessaloniki Science Center and Technology Museum
Heliograph
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A heliograph is a solar telegraph system that signals by flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shut
Hydraulic telegraph
…Phryctoria Heliograph Optical communication…
Fig. 1: Signaling with a Mance heliograph; Alaska–Canada border, 1910.
Fig. 1: Signaling with a Mance heliograph; Alaska–Canada border, 1910.
Fig. 2: A German heliograph made by R. Fuess in Berlin, on display at the Museum of Communication in Frankfurt
Fig. 2: A German heliograph made by R. Fuess in Berlin, on display at the Museum of Communication in Frankfurt
Fig. 3 A Turkish / Ottoman Empire heliograph military crew at Huj during the First World War, 1917
Fig. 3 A Turkish / Ottoman Empire heliograph military crew at Huj during the First World War, 1917
Fig. 4: A U.S. Army Signal Corps heliograph instrument, 1898
Fig. 4: A U.S. Army Signal Corps heliograph instrument, 1898