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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 ...
A water clock or clepsydra 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 of liquid can then be measured. Water clocks are one of the oldest time-measuring instruments. [2]
A limestone Egyptian water clock, 285–246 BC (Oriental Institute, Chicago). The oldest description of a clepsydra, or water clock, is from the tomb inscription of an early 18th Dynasty (c. 1500 BC) Egyptian court official named Amenemhet, who is identified as its inventor. [27]
Zhang Sixun (10th century AD), Chinese engineer, clepsydra with water wheel. Su Song (11th century AD), Chinese engineer, clepsydra with water wheel and ratchet. Al-Dschazarī, Arabic engineer and author of the 12th century, elephant clock.
Clepsydra, an alternative name for a water clock. In ancient Greece, a device (now called a water thief) for drawing liquids from vats too large to pour, which utilized the principles of air pressure to transport the liquid from one container to another. Clepsydra Geyser in the Lower Geyser Basin of Yellowstone; Clepsydra, a genus of protists
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The water clock with Florence Street mall behind. The sculpture is a combination of three water-powered clocks – a 4th-century BC Greek clepsydra, an 11th-century Chinese water wheel clock and a 17th-century Swiss pendulum clock – plus a 17-note bronze carillon to ring the hour based on a 250-year-old design found in an old English church.
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