4 Stethoscope. A- telescopic, see Maw 1882. B- made of aluminium, like Hughe's but no record of material. C- unusual design, said to be 1845-1855. D- Italian, but like Williams.

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: 4 Stethoscope. A- telescopic, see Maw 1882. B- made of aluminium, like Hughe's but no record of material. C- unusual design, said to be 1845-1855. D- Italian, but like Williams. Wellcome Collection. Source: Wellcome Collection.