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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / New York Public Library |
Taille de l’image : | 2712 px × 4292 px |
Model Release : | Non requis |
Restrictions : |
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