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Title: Clepsydra: Water Clock.
Caption: 19th Century diagram of a simple water clock where water is allowed to escape at a controlled rate from a spout at the bottom. The divisions allowed for the passing of each hour differ according to the dimensions of the vessel and the head of water still in it.
Credit: Album / Universal Images Group / Universal History Archive \ UIG
Image size: 3964 × 5290 px | 60.0 MB
Print size: 33.6 × 44.8 cm | 1560.6 × 2082.7 in (300 dpi)