Jagyeongnu, made in 1434 during the reign of King Sejong of Joseon (1392-1910), was the first water clock that was devised to ...

If you visit Yellowstone park, you might see a geyser named the Clepsydra Geyser. It was named after the Greek water clock because, prior to a 1959 earthquake, it erupted every three minutes.

Clepsydra is an ancient Greek water clock literally to steal water This film envisions the strip of celluloid going vertically through a projector as a sprocketed waterfall random events measured ...