Some authors, however, claim that water clocks appeared in China as early as 4000 BC.
Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon, Egypt, and Persia around the 16th century BC. Water clocks are one of the oldest time-measuring instruments. 'water thief') is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured. The bottom is a reconstruction of a clay original.Ī water clock or clepsydra (from Ancient Greek κλεψύδρα ( klepsúdra) ' pipette, water clock' from κλέπτω ( kléptō) 'to steal', and ὕδωρ ( hydor) 'water' lit. The top is an original from the late 5th century BC. A display of two outflow water clocks from the Ancient Agora Museum in Athens. For the individual water clock at The Children's Museum of Indianapolis, see Water clock (Indianapolis).
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