water clock


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water clock:

see clepsydraclepsydra
or water clock,
ancient device for measuring time by means of the flow of water from a container. A simple form of clepsydra was an earthenware vessel with a small opening through which the water dripped; as the water level dropped, it exposed marks on the
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.

water clock

[′wȯd·ər ‚kläk]
(horology)
An ancient device to estimate time; the operation depended upon the slow emptying of water from one graduated vessel into another, and the graduations marked the time periods.
References in periodicals archive ?
There are no water clock limits on input from our readers, so call me at 215405-6083, or email me at Eve@DirectorsAndBoards.com.
It was time to move on from sundials, hourglasses and water clocks.
The Chinese team speculated that at least one of these chambers was the sealed room where Zhang's demonstrational armillary sphere, powered by the water clock, mimicked the motion of the sky.
As an extension, have them try to adjust their water clocks to measure exactly 30 seconds or 1 minute.
The simplest water clock was a bowl with a very tiny hole in the bottom.
86637, and (8), a similar table from Tanis, are discussed in the general survey;] (9) Papyrus Carlsberg 9; (10) Sothic dates, i.e., Egyptian dates of the heliacal rising of Sirius (Greek Sothis); (11) the decanal clock on Meshet's coffin; (12) the Book of Nut; (13) the dramatic text in Seti I's cenotaph; (14) the Ramesside star clock; (15) Amenemhet's water clock; (16) the shadow clock in Seti I's cenotaph; (17) the zodiacs in the temples at Esna and Dendera; and (18) the statue of the astronomer Harkhebi.
The first thing that caught his eye was the giant water clock on the main floor.
I walked up to it and suddenly realized that it wasn't just a sculpture; it was actually a giant water clock. Minutes, seconds, and hours were measured off in this clock as the water flowed into its various parts.
Non-mechanical devices for measuring time like a water clock, candle and sand-timer are to be built into the wall.
The first advance over the water clock (see 270 B.C.) came in the fourteenth century.
Other treasures on show include an Egyptian water clock dating from around 1400 BC and a crab - a very dead crab - collected by Charles Darwin on one of his expeditions.
Visitors had hands-on experience of Zheng He model boat, Elephant Water Clock and two South-Facing Chariots encouraging visitors of all ages to discover and understand some aspects of the contribution of historic scholars to science and technology.