water clock - meaning and definition. What is water clock
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What (who) is water clock - definition

TIMEPIECE IN WHICH TIME IS MEASURED BY THE FLOW OF LIQUID INTO A VESSEL
Clepsydra (clock); Water-clock; Waterclock; Water clocks; Water Clock; Waterclocks; Water-powered clock; Water powered clocks; Water powered clock
  • Eschinardi's water clock (Reproduced from [[Francesco Eschinardi]], ''Appendix Ad Exodium de Tympano'')
  • A display of two outflow water clocks from the Ancient Agora Museum in Athens. The top is an original from the late 5th century BC. The bottom is a reconstruction of a clay original.
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  • Ancient Persian clock
  • An early 19th-century illustration<ref>This engraving is taken from "Rees's Clocks, Watches, and Chronometers 1819–20. The design of the illustration was modified from Claude Perrault's illustrations in his 1684 translation of Vitruvius's Les Dix Livres d'Architecture (1st century BC), of which he describes Ctesibius's clepsydra in great length.</ref> of [[Ctesibius]]'s (285–222 BC) clepsydra from the 3rd century BC. The hour indicator ascends as water flows in. Also, a series of gears rotate a cylinder to correspond to the temporal hours.
  • The water-powered mechanism of [[Su Song]]'s astronomical clock tower, featuring a clepsydra tank, [[waterwheel]], [[escapement]] mechanism, and [[chain drive]] to power an [[armillary sphere]] and 113 [[striking clock]] jacks to sound the hours and to display informative plaques
  • Water-powered automatic [[castle clock]] of [[Al-Jazari]], 12th century.
  • was]] hieroglyphs. Late period, 30th Dynasty. From Egypt. The [[Petrie Museum of Egyptian Archaeology]], London
  • An incomplete scaled-down model of Jang Yeong-sil's self-striking water clock
  • Using a water clock for [[goldbeating]] a [[goldleaf]] in [[Mandalay]] ([[Myanmar]]).

water-clock         
n.
Clepsydra.
Water clock         
A water clock or clepsydra (Greek , 'to steal'; , 'water') is any 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 is then measured.
Water clock         
·- An instrument or machine serving to measure time by the fall, or flow, of a certain quantity of water; a clepsydra.

Wikipedia

Water clock

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 is then measured.

Water clocks are one of the oldest time-measuring instruments. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon, Egypt, and Persia 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. Some authors, however, claim that water clocks appeared in China as early as 4000 BC. Water clocks were also used in ancient Greece and ancient Rome, described by technical writers such as Ctesibius and Vitruvius.

Examples of use of water clock
1. The piece is one of 12 animal heads from the Chinese zodiac that formed part of an elaborate water clock fountain designed by Jesuit missionaries.
2. Nick Fletcher Thursday September 14, 2006 The Guardian Shares in AWG, which runs Anglian Water, clock up an 11% rise on bid speculation.