The oldest documentation of the water clock …

Years: 1485BCE - 1342BCE

The oldest documentation of the water clock is the tomb inscription of the sixteenth century BCE Egyptian court official Amenemhet, which identifies him as its inventor; the oldest water clock of which there is physical evidence dates to around 1400 BCE and is used in the Temple of Amen-Re.

These are bucket-shaped stone vessels from which water drains by way of small holes in the bases.

Hours are marked inside the vessels by twelve separate columns with consistently spaced markings on the inside to measure the passage of "hours" as the water level reached them.

The columns are for each of the twelve months to allow for the variations of the seasonal hours.

These clocks are used to determine hours at night, but may have been used in daylight as well.

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