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 1155), enlarged by Mao Pang-Han (c. 1170). On the right, a drawing of the archaic inflow type of camp clepsydr

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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 1155), enlarged by Mao Pang-Han (c. 1170). On the right, a drawing of the archaic inflow type of camp clepsydra described in the Chou Li, with a torch beside it to ward off the frost. On the left, "Mr. Wang's lotus clepsydra", , the design of Wang P'u (c. 1135), which includes an overflow tank and an occlusive indicator-rod.

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Size: 3688px × 5615px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No

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