Civil engineering: canals (below), and a photometer (above). Engraving by Mutlow.
- Reference:
- 44546i
Licence: Public Domain Mark
Credit: Civil engineering: canals (below), and a photometer (above). Engraving by Mutlow. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0024395/full/800%2C/0/default.jpg)