water clock

Perhaps the earliest mechanical time measure was the clepsydra, or water clock.

This water clock was called a clepsydra, the name being taken from two Greek words meaning 'thief of water.'

The Djyotisha also teaches the art of constructing a clepsydra, or water-clock.

The water-clock (clepsydra) served as a measure of time, especially in affairs connected with the administration of justice.

It was a delightful visit, but we could not remain so long as we wished, for we had to see the water clock.