The book described 50 mechanical devices in 6 categories, including water clocks.

There is also evidence for the use of water clocks in anciet Egypt.

The water clock said it was the middle of the day.

By a water clock in the passage, they knew the evening was well advanced.

During the pauses in his speech the dripping of the water clock was no longer to be heard.

Then I will give you half the time it takes a water clock to empty.

To measure this pulse, he made use of a water clock.

The water clocks used to time the lawyers' speeches fascinated her.

There were several types of water clocks, some more elaborate than others.

Some of the most elaborate water clocks were designed by Muslim engineers.