"Earthenware containers filled with water, was drilled at the bottom, the water will flow out of the container gradually. Like stealing water, "so the ancient Greeks were the period running water until the container is 1 clepsydra (Yoksan Suthat.2544: 159), but this requires a water clock water every time you run out of time 1 clepsydra, and in winter the water is frozen, making it impossible to watch.
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