Acoustics: a carbon microphone invented by D.E. Hughes. Wood engraving by Baud after Broux.

  • Broux.
Reference:
47038i
Catalogue details

Licence: Public Domain Mark

Credit: Acoustics: a carbon microphone invented by D.E. Hughes. Wood engraving by Baud after Broux. Wellcome Collection. Source: Wellcome Collection.

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