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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, 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
Egypt's Pyramid Construction Secret: Just Add Water. For centuries, people have been trying to figure out how the ancient Egyptians moved the huge stone blocks needed to build the pyramids: sleds ...
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
"Book Review: Korean Water-Clocks: "Chagyongnu", the Striking Clepsydra, and the History of Control and Instrumentation Engineering". Technology and Culture . 39 (3): 553– 555.
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