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.
Reconstruction, Thessaloniki Science Center and Technology Museum
Reconstructed model, messages attached to rod, Thessaloniki Science Center and Technology Museum
Phryctoria
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Phryctoria was a semaphore system used in Ancient Greece. The phryctoriae were towers built on selected mountaintops so that one tower would be visible to the next tower. The towers were used for the
A small reconstruction of fire signals and beacons in Kotsanas Museum of Ancient Greek Technology, Athens, Greece.