Licence: Attribution 4.0 International (CC BY 4.0)
Credit: A machine opperator, Nanking arsenal, Nanking, Jiangsu province, China. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/L0018890/full/800%2C/0/default.jpg)
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: A machine opperator, Nanking arsenal, Nanking, Jiangsu province, China. Wellcome Collection. Source: Wellcome Collection.