Hearing aid for constant use. Two light cornets of imitation tortoiseshell joined by metal spring forming a head-band. Introduction of this form of instrument attributed to Napoleon's surgeon D. J. Larrey (1776-1842).

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Hearing aid for constant use. Two light cornets of imitation tortoiseshell joined by metal spring forming a head-band. Introduction of this form of instrument attributed to Napoleon's surgeon D. J. Larrey (1776-1842). Wellcome Collection. Source: Wellcome Collection.