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
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Publication/Creation

London (Paternoster Row) : Sherwood & Co., 1 May 1812.

Physical description

1 print : engraving ; border 11.2 x 19 cm

Contributors

Lettering

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

Reference

Wellcome Collection 45421i

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