Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Cannon in arsenal, Nanking, Jiangsu province, China. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Cannon in arsenal, Nanking, Jiangsu province, China. Wellcome Collection. Source: Wellcome Collection.