clepsydra

An Egyptian clepsydra

Also known as a water clock, an instrument in which the discharge of water from a storage tank is monitored in order to measure the passing of time. Clepsydras were used from ancient times until the Renaissance. "Clepsydra" is Greek for "water thief."

Related categories

• TIME MEASUREMENT AND PUZZLES
• HISTORY OF SCIENCE

Also on this site:

Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History

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