Three small steel set-squares, with brass stocks

Made:
1756-1773 in United Kingdom
maker:
James Watt

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

3 Small steel set-squares, with brass stocks, on one stock is engraved “J Watt”, “J.W.” and Figures, by James Watt, United Kingdom, 1756-1773.

These small squares were made by James Watt, and are dated to the period when he was working as an instrument-maker in Glasgow. They are characterful and have been used hard, having figures test-stamped and lines cut into the brass, and the larger of the three has Watt's name engraved into its surface.

Details

Category:
James Watt's Garret Workshop
Object Number:
1924-792/1091
Materials:
brass (copper, zinc alloy) and steel (metal)
Measurements:
small: 4 mm x 76 mm x 57 mm, .04kg
medium: 4 mm x 108 mm x 72 mm, .08kg
big: 5 mm x 104 mm x 73 mm, .07kg
type:
stock
credit:
Major J.M. Gibson-Watt