"The simplest and perhaps earliest consisted of an earthen vessel with a small hole in the bottom. This was filled with water up to a certain mark and the water was allowed to trickle out of the hole. It would empty itself in approximately the same intervals of time. It was perhaps used for limiting the length of public speeches and the like. In fact there are quite a few references in Greek and Roman writings which would indicate this to have been a fact."
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Willis Isbister Milham,
https://en.wikiquote.org/wiki/Clock
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Clock
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