The water clock

During the seventeenth century the water clock was no
longer in widespread use in order to tell the time (imagine
how much water it takes to turn a water clock for a week!),
but was still used for precise time measurements. The water
clock is made of a large container full of water, at the bottom
of which is a pipe from which a thin stream of water spills
into a glass. The same amount of water flows into the glass
every second. By measuring the amount of water in the glass
it is possible to measure how much time has passed.
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