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).

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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. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.