Licence: Public Domain Mark
Credit: Clocks: diagrams of water-clocks. Engraving, c. 1861. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0024612ER/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Clocks: diagrams of water-clocks. Engraving, c. 1861. Wellcome Collection. Source: Wellcome Collection.