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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 ...
By measuring the level of water remaining in the vessel, the time can be measured with uniform graduation. This is an example of outflow clepsydra. Since the water outflow rate is higher when the water level is higher (due to more pressure), the fluid's volume should be more than a simple cylinder when the water level is high.
The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon and Egypt around the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain.
Modern water clock by Bernard Gitton Bernard Gitton ( French pronunciation: [bɛʁnaʁ ʒitɔ̃] ); born 24 June 1935 [ 1 ] ) is a French physicist and artist who has built modern water clocks , fountains and other devices relating art and science.
Water clock → History of the water clock – This article does not describe how a water clock works at all, but rather is only about the history of water clocks, a new article should be made to discuss different types of water clocks and how they work. InsertCleverPhraseHere InsertTalkHere 01:41, 16 December 2015 (UTC)
The Clock of Flowing Time in Berlin. The Clock of Flowing Time (German: Uhr der fließenden Zeit) [1] is a 13 metres (43 ft) high water clock extending over three floors in the Berlin Europa-Center. The clock was designed by the French artist Bernard Gitton and set up in 1982.
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A model of the water clock. The Borugak Jagyeongnu ("Water Clock of Borugak Pavilion"), classified as a scientific instrument, is the 229th National Treasure of South Korea and was designated by the South Korean government on March 3, 1985. The water clock is currently held and managed by the National Palace Museum of Korea in Seoul.