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 ?
Time, an insistent theme of this volume and even more so of Until Before After, enters this poem through the dripping water-clock and the possibility of reading "watch" as a time-piece rather than a contingent of guards.
To the maze at Hampton Court, the water-clock by Covent Garden, the Raphael cartoons, that shop with all the buttons made of horn, or even the bistro where you left your first-edition, second-hand Elizabeth Bowen - we never returned.
During the visit, curators presented HH Sheikha Moza with several noteworthy collection items, including a beautifully illustrated copy of a text on cosmography and natural history, various maps of the region and the earliest recorded copy of Archimides' treatise on water-clocks.