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

  • Broux.
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47038i
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Acoustics: a carbon microphone invented by D.E. Hughes. Wood engraving by Baud after Broux. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.

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[Paris]

Physical description

1 print : wood engraving

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Le microphone de Hughes.

Reference

Wellcome Collection 47038i

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