Acoustics: an Edison phonograph with a carbon microphone. Coloured wood engraving after J.T. Balcomb.
- Balcomb, J. T.
- Date:
- 1878
- Reference:
- 47037i
Licence: Public Domain Mark
Credit: Acoustics: an Edison phonograph with a carbon microphone. Coloured wood engraving after J.T. Balcomb. Wellcome Collection. Source: Wellcome Collection.