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Title: Water Clock Diagram
Caption: Water clock design by the Greek inventor and mathematician Ctesibius (285 - 222 BC). As water fills the cylinder, the figure rises, pointing to the time. The cylinder empties automatically to fill a drum that rotates the hour scale.
Category: SCIENCE • History: Ancient
Credit: Album / Science Source / New York Public Library
Image size: 2712 × 4292 px | 33.3 MB
Print size: 23.0 × 36.3 cm | 1067.7 × 1689.8 in (300 dpi)