BeschreibungGreek Hydraulic Telegraph of Aeneas relief.jpg
English: A relief of the Greek 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.
Original relief: unknown; modern photograph of the relief contributed by Demetre Valaris via his website (no copyright applies)
Ancient Greek artwork dating back a few thousand years, thus in the public domain. No copyright applies to a photographic reproduction.
Lizenz
Public domainPublic domainfalsefalse
Dieses Werk ist gemeinfrei, weil seine urheberrechtliche Schutzfrist abgelaufen ist. Dies gilt für das Herkunftsland des Werks und alle weiteren Staaten mit einer gesetzlichen Schutzfrist von 100 oder weniger Jahren nach dem Tod des Urhebers.
Parallel zu dieser Lizenz muss auch ein Lizenzbaustein für die United States public domain gesetzt werden, um anzuzeigen, dass dieses Werk auch in den Vereinigten Staaten gemeinfrei ist.
{{Information |Description ={{en|1=A relief of the Greek 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 s