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.
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 water clocks used in China were just the opposite.
Non-mechanical devices for measuring time like a water clock, candle and sand-timer are to be built into the wall.
King Sejong's other important scientific inventions, such as the sundial, water clock and rain gauge, will be displayed in front of the statue.
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.
Or Couple, 2008, an ornate water clock filled with, a yellowish liquid placed delicately on its side on a small, padded display.
The most precise time-keeping device of the ancient world was the water clock, or clepsydra, one of which was found in the tomb of the Egyptian pharaoh Amenhotep I (1525-1504 BC).
Across the street from it stands the remains of Fes's once-grand medieval water clock, now ruined.