Tropometer by E.B. Meyrowitz.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Tropometer by E.B. Meyrowitz. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Tropometer by E.B. Meyrowitz. Wellcome Collection. Source: Wellcome Collection.