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Spanish Mission San Antonio (5 years and 3681 days ago)
Part of the Water Clock,
Drum Tower, Beijing
This is a replica of an ingenious Song dynasty clepsydra (water clock). The clock was regulated by the flow of water between the three buckets arranged in a "staircase" on top of the device. A cylinder, holds a level stick which indicated the time according to the water level inside the cylinder. (5 years and 3684 days ago)
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