Three inventions: a torsion-bar for measuring forces, a drill-bit, and a lens. Engraving by Mutlow, c. 1812, after J. Farey.
- Farey, John, 1791-1851.
- Date:
- 1 May 1812
- Reference:
- 45421i
Licence: Public Domain Mark
Credit: Three inventions: a torsion-bar for measuring forces, a drill-bit, and a lens. Engraving by Mutlow, c. 1812, after J. Farey. Wellcome Collection. Source: Wellcome Collection.
