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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 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]
Category:Egyptian hieroglyphs: fishes and parts of fishes (0) L § Invertebrata and lesser animals: Category:Egyptian hieroglyphs: invertebrates and lesser animals (3) M § Trees and plants: Category:Egyptian hieroglyphs: trees and plants (6) N § Sky, earth, water: Category:Egyptian hieroglyphs: sky-earth-water (16) NU § Upper nile
Clepsydra may refer to: 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.
Smaller units of time were vague approximations for most of Egyptian history. Hours—known by a variant of the word for "stars" [71] —were initially only demarcated at night and varied in length. They were measured using decan stars and by water clocks. Equal 24-part divisions of the day were only introduced in 127 BC.
Water clocks or clepsydra measure a gain or loss of water by using drops of uniform size and frequency. The Persian fenjaan made use of the constant time it took for the sinking of a floating bowl with a hole in its underside. It is unknown when or where the oil-lamp clock was first introduced. This clock was mainly used during the mid-18th ...
Korean Water Clocks: Jagyongnu, The Striking Clepsydra and The History of Control and Instrumentation Engineering (in Korean). Seoul: Konkuk University Press. Seoul: Konkuk University Press. Nam, Moon-Hyon (1998).
Ctesibius' water clock, as visualized by the 17th-century French architect Claude Perrault. Ctesibius or Ktesibios or Tesibius (Ancient Greek: Κτησίβιος; fl. 285–222 BCE) was a Greek inventor and mathematician in Alexandria, Ptolemaic Egypt. [1] Very little is known of Ctesibius' life, but his inventions were well known in his ...