Gallery›Wellcome Collection›Three inventions: a torsion-bar for measuring forces, a drill-bit, and a lens. Engraving by Mutlow and Russell, c. 1812, after J. Farey.
Three inventions: a torsion-bar for measuring forces, a drill-bit, and a lens. Engraving by Mutlow and Russell, c. 1812, after J. Farey.
Wellcome Collection

Three inventions: a torsion-bar for measuring forces, a drill-bit, and a lens. Engraving by Mutlow and Russell, c. 1812, after J. Farey.

John Farey · 1812

CC0 — Public Domain
Wellcome Collection

Lettering: Mr. Gregory's contrivance to determine horse-power in mills. American borer. Mr. Ez. Walker on light. ; Mutlow sc. ; Russell cot.

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