Stethoscope with rubber ring as percussor. A grooved, but ring missing, B grooved, but ring missing, Burrows, Arnold, circa 1895

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Stethoscope with rubber ring as percussor. A grooved, but ring missing, B grooved, but ring missing, Burrows, Arnold, circa 1895. Wellcome Collection. Source: Wellcome Collection.