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| View Original: | Greek_Hydraulic_Telegraph_of_Aeneas_relief.jpg (356x458) | |||
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| Keywords: Greek Hydraulic Telegraph of Aeneas relief.jpg hydraulic telegraph of Aeneas depicting one half of a telegraph system The soldier holding the raised torch is watching the descent of a floating message indicator stick which is marked with message codes as water is released from the reservoir chamber the stick is floating in When the float indicator reaches the appropriate level corresponding to a certain predetermined message the soldier's flame will be hidden or extinguished On the distant hill shown near the top left of the relief an observer with an identical hydraulic chamber is observing the flame and waiting for it to be extinguished at which time that reservoir spout will be closed and the message read from the identical floating message indicator stick http //www qsl net/sv1uy/index html hydraulic Original relief unknown; modern photograph of the relief contributed by Demetre Valaris via his website no copyright applies date unknown Ancient Greek artwork dating back a few thousand years thus in the public domain No copyright applies to a photographic reproduction PD-old-100 Hydraulic telegraph Military communications | ||||
