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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]
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 ...
Ancient Egyptian sundial (c. 1500 BC), from the Valley of the Kings, used for measuring work hour. Daytime divided into 12 parts. The ancient Egyptians were one of the first cultures to widely divide days into generally agreed-upon equal parts, using early timekeeping devices such as sundials, shadow clocks, and merkhets (plumb-lines used by early astronomers).
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.
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
Water clock — The oldest water clock of which there is physical evidence dates to c. 1417–1379 BC, during the reign of Amenhotep III where it was used in the Temple of Amen-Re at Karnak. [153] The oldest documentation of the water clock is the tomb inscription of the 16th century BC Egyptian court official Amenemhet, which identifies him as ...
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).