Oldest Water Clock Illustration

The oldest printed illustration of a water clock (clepsydras) in any culture, from a Sung edition of the Liu Ching T'u of Yang Chia (c A.D. 1155), enlarged by Mao Pang-Han (c. A.D. 1170). This is Mr. Wang's lotus clepsydra, i.e. the design of Wang P'u (c. 1135), which includes an overflow tank and an occlusive indicator-rod

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Ching Clepsydra Diagram Horology Keeper Keeping Measure Oldest Sung Telling Time Keeper Time Keeping Time-keeper Time-keeping Time-telling Timekeeping Wang Waterclock

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