Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Two nitrous oxide cylinders, England, 1915-1940. Science Museum, London. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Two nitrous oxide cylinders, England, 1915-1940. Science Museum, London. Source: Wellcome Collection.