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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 ...
Water clock (representing a clock at the royal court in Paris, c.1250) The first innovations to improve on the accuracy of the hourglass and the water clock occurred in the 10th century, when attempts were made to slow their rate of flow using friction or the force of gravity. [78]
1 Overview of water clocks and other time instruments. 2 Arabic & Islamic water clocks. 3 Babylonian water clocks. 4 Chinese water clocks. 5 Egyptian water clocks.
[32] [33] Early verge clocks were probably no more accurate than the previous water clocks, [16] but they did not require water to be manually hauled to fill the reservoir, did not freeze in winter, and were a more promising technology for innovation. By the mid-17th century, when the pendulum replaced the foliot, the best verge and foliot ...
Inventions that are credited to the ancient Greeks include the gear, screw, rotary mills, bronze casting techniques, water clock, water organ, the torsion catapult, the use of steam to operate some experimental machines and toys, and a chart to find prime numbers. Many of these inventions occurred late in the Greek period, often inspired by the ...
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Scale model of the ‘water’ half of Jang Yeong-sil's self-striking water clock. Samguk Sagi records that an office overseeing the use of water clocks had been established during the Three Kingdoms period. The Korean water clock consisted of two stacked jars of water, with water dropping from the top to the bottom at a measured rate.
Keith Farquhar: Something entirely different … there's nothing here then or now that would suggest a 15-year-old girl should, all of a sudden, be face down in a small amount of water and mud and ...