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 ?
The simplest water clock was a bowl with a very tiny hole in the bottom.
Romans would change the setting of their water clocks to make better use of the seasons.
Horologia, from Greek, means to tell the hour and was used to describe very early mechanical clocks, including water clocks.
The gallery showcases a range of devices from sand-glasses to sundials, water clocks to wristwatches.