Water Clock

A water clock, or clepsydra, is a timepiece by which time is measured by the regulated flow of liquid into or out from a vessel, and where the amount of liquid can then be measured.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.5

LEVERLAB

How things move — simple machines, mechanics, and hands-on STEM.

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Museum entries, images, and facts are drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses.