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Mancheng County (Mànchéng Xiàn) is a county of west-central Hebei province, China, in the eastern foothills of the Taihang Mountains. It is administratively part of Baoding prefecture-level city, of which the Mancheng is a northwestern suburb.<br/><br/> Mancheng is the site of the Han dynasty tombs of king/prince Liu Sheng and his wife Dou Wan.
A water clock or clepsydra is any 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.