Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Model of the ‘Optimus’ water closet, England, 1870. Science Museum, London. Source: Wellcome Collection.

Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Model of the ‘Optimus’ water closet, England, 1870. Science Museum, London. Source: Wellcome Collection.
