Dudgeon's Sphygmograph, diagram of action
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Dudgeon's Sphygmograph, diagram of action. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Dudgeon's Sphygmograph, diagram of action. Wellcome Collection. Source: Wellcome Collection.