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A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water'; lit. ' water thief ' ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount ...
Inside: Floor of tower showing channels and holes for the water driving the mechanism. The turret at the back was a water tank, fed from a spring on the Athens acropolis above. A valve mechanism allowed water to flow into the clock mechanism via a channel cut in the floor; it may also have branched into two other channels to the side.
Site of the Klepsydra, Athens. The Klepsydra [1] of the Acropolis of Athens is a natural spring on the north-west slope of the Acropolis hill, [2] near the intersection of the Peripatos and the Panathenaic Way. It had been in use as a source of water since prehistoric times but sometime in the fifth century BCE the site was developed with ...
Alarm clock: The Hellenistic engineer and inventor Ctesibius (fl. 285–222 BC) fitted his clepsydras with a dial and pointer for indicating the time, and added elaborate "alarm systems, which could be made to drop pebbles on a gong, or blow trumpets (by forcing bell-jars down into water and taking the compressed air through a beating reed) at ...
The Tower of the Winds on the Roman agora in Athens featured atop a wind vane in the form of a bronze Triton holding a rod in his outstretched hand rotating to the wind blowing. Below, its frieze was adorned with the eight wind deities. The 8 m high structure also featured sundials and a water clock inside dates from around 50 BC. [44] Clock ...
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The Tower of the Winds, Athens. Andronicus of Cyrrhus or Andronicus Cyrrhestes (Latin; Ancient Greek: Ἀνδρόνικος Κυρρήστης, Andrónikos Kyrrhēstēs; fl. c. 100 BC) was a Macedonian astronomer best known for designing the Tower of the Winds in Roman Athens.
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