How To Use Water clock In A Sentence

Over thousands of years, the accuracy of maps didn't improve significantly faster than the accuracy of primitive timepieces such as the sundial or water clock.
The invention of timekeeping devices - hourglasses, water clocks, graduated tapers - made it possible for early civilized people to begin to control and standardize the units of time, and in doing so to coordinate their lives.
He designed a lotus clepsydra, that is a water clock which had a bowl shaped like a lotus flower on the top into which water dripped.
The sundial's nocturnal counterpart, the water clock, was designed to measure temporal hours at night.
They were originally part of a rococco clepsydra, or water clock, that featured the twelve animals of the Chinese zodiac and was affixed to a pavilion inspired by Versailles. The Affair of the Chinese Bronze Heads

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He is also said to have constructed a armillary sphere, a water clock, and a bronze gnomon, a pointer whose shadow gives the time of mid-day.
Further back, the Chinese and the Romans used clepsydras (water clocks) at about the same time, although Egyptian sundials go further back.
Of course the sun could not be used to tell the time at night and clepsydras or water clocks were in use in Egypt by 1500 BC.