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Full-text Search for "water clock"
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water clock definitions

WordNet (r) 3.0 (2005)

n
1: clock that measures time by the escape of water [syn: water clock, clepsydra, water glass]

Merriam Webster's

noun Date: 1601 an instrument designed to measure time by the fall or flow of a quantity of water called also clepsydra

Britannica Concise

Ancient device for measuring time by the gradual flow of water. One form, used by N. Amer. Indians and some African peoples, consisted of a small boat or floating vessel that shipped water through a hole until it sank. In another form, water escaped through a hole in a vessel marked with graduated lines; specimens from Egypt date from the 14th cent. BC. The Romans invented a clepsydra consisting of a cylinder into which water dripped from a reservoir; a float provided readings against a scale on the cylinder wall. Galileo used a mercury clepsydra to time his experimental falling bodies. See also clock.

Webster's 1913 Dictionary

Water clock Wa"ter clock` An instrument or machine serving to measure time by the fall, or flow, of a certain quantity of water; a clepsydra.



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