Slide rule

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probably made in London

Postcard of Slide rule.
© National Museums Scotland

Slide rule

This brass circular slide rule was made around 1850, probably by the firm of William Cary, a scientific instrument maker based in London, whose business continued after his death in 1825.

The rule is inscribed 'Cary London' and has four movable concentric rings with scales, sines on the outside and tangents on the outer third scale. The instrument is stamped below the centre, 'E. Sang', for the owner Dr Edward Sang (1805-91).

Sang was an eminent mathematician who was professor of mechanical philosophy at the University of Constantinople until the outbreak of the Crimean War.

Record details

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Online ID: 000-100-102-693-C
Image Rights Holder: National Museums Scotland
Project: 0098: National Museums Scotland
Project description | View all records in project
Ref: National Museums Scotland  T.1946.6
Date: Around 1850
c. 1850
Material: Brass. Inscription: Cary, London; E Sang [below centre]
Dimensions: 5.00" D x 0.19" thick
What: Slide rule, circular
Subject: 19. MATHEMATICS (Departmental Classification)
Who: Cary, London (Slide rule maker)
E. Sang (Eponym ?)
Where: England, London
Description: Brass circular slide rule, inscribed with the maker's name and below centre, E Sang, by Cary, London, c. 1850
  • Obituary of Edward Sang, in Proceedings of the Royal Society of Edinburgh Vol XIX (1891-2) pp 7-8 
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