Slide rule (detail) (2 of 2)

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This slide rule was made around 1820, and retailed by W. & S. Jones, scientific instrument makers based in London. It was designed by John Robertson (1712-76) in 1757.

It incorporates the scales of a Gunter rule for undertaking standard navigational problems. In addition, the design has a sliding brass index, or cursor, and a slow motion screw for exact adjustment for the sliding rule. This side has natural numbers. W. & S. Jones, whose signature is on the brass index (not shown in this picture) offered this scale from 1797, for £1 10s (=£1.50). On the edges, there are linear and cube root scales.

Robertson was master of the mathematical school at Christ's Hospital, London from 1748, and in 1755 became master of the Royal Naval Academy. Portsmouth, which he left in 1766, becoming clerk and librarian to the Royal Society in 1768. He produced a number of publications, and after his death, William Mountaine described his improved slide-rule in 1778: it was a navigator's 30-inch rule with a brass cursor which allowed the scales to be precisely matched.

Record details

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• Online ID: 000-190-002-256-C
• Image Rights Holder: National Museums Scotland
• Project: National Museums Scotland
  Project description   View all records in project
• Ref: National Museums Scotland  T.1978.94
• Date: Around 1820
  c. 1820
  
• Material: Slide-rule
  
• Dimensions: 880 mm x 65 mm x 10 mm
  
• What: Slide-rule
  
• Subject:
• Who: Gunter (Eponym)
  W. and S. Jones, London (Maker)
  
• Where: England, London
  
• Event:
• Description: Slide-rule by W. and S. Jones of London, made about 1820
  
• References:
  • For a biography of Robertson, see Taylor, E. G. R., The Mathematical Practioners of Hanoverian England, 1714-1840. Cambridge: 1966, p 189Cajori, Florian, A History of the Logarithmic Slide Rules and Allied instruments. Mendham, N.J. : 1994, pp 32-4 
  • Mountaine, William, The Use of Gunter's Sector as improved by Mr John Robertson. London: 1778 
  • Robertson, John, Treatise on Mathematical Instruments. London: 1757 
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