Ammoniaphone, ‘for voice cultivation by chemical means’, English, 1871-1900. Top three quarter view. Light grey background

  • Science Museum, London
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Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Ammoniaphone, ‘for voice cultivation by chemical means’, English, 1871-1900. Top three quarter view. Light grey background. Science Museum, London. Source: Wellcome Collection.

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