3-038-603 - LTL/Heritage Images

Roman Birth House of Mammisi, Temple complex, Dendera, Egypt, 68-117 AD. Relief showing Emperor Trajan offering a clepsydra - detail of his hands. A water clock or clepsydra is a timepiece by which time is measured by the regulated flow of liquid into or out of a vessel, and where the amount of liquid can then be measured. Water clocks are one of the oldest time-measuring instruments. First Intercolumnar wall - South face.