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32 Circular Slide Rule

image of Circular Slide Rule

This ivory and silver slide rule has a double radius logarithmic line on the stock, a single radius logarithmic line on both sliders and is stamped ‘LAMB LONDON’. It was made about 1827 by the watchmaker and engraver Joseph Lamb, of 6 Upper Marylebone Street, London.

The curious aspect of this slide rule is that it is almost identical to an earlier slide rule produced by the instrument maker Anthony Lamb (fl.1703-1784). As an associate of the notorious highwayman Jack Sheppard, Anthony Lamb was transported to Maryland in 1724 where he continued his trade. Perhaps the two were related and Joseph Lamb copied an example in his possession, passing it off as his own invention.

English ca.1827.

See: Joseph Lamb, Description of a Concentric Circular Proportioner, London 1827.
Pigot & Co., London Directory, 1832.
Watkins and Hill, Catalogue, London 1832, p.20.
Transactions of the American Philosophical Society, Volume 74, Part 1, 1984, pp.53-63.
Silvio A. Bedini, At the Sign of the Compass and Quadrant, The Life and Times of Anthony Lamb.

Collection: Peter Delehar, London

Objects lent by Peter Delehar, London:

08. Circular Slide Rule on a Snuff Box, by Hoyau, Paris, 1816

11. Reversible Circular Slide Rule, English, c.1840

25. Slide Rules - a Selection of the Original Pocket Calculators

26. Javal's Ophthalmic Slide Rule, by A. Cretes, Paris, c. 1875

27. Triangular Slide Rule with Four Sliders, by Elliott, London, c. 1870

28. Oil Calculation Slide Rule Designed by Forrest M. Towl, New York, c. 1889

29. Master Rule and Gauging Slide Rule, by Dring & Fage, London, 19th Century

30. Anderson Celluloid Gridiron Slide Rule, by Casella & Co, London, c. 1903

31. Slide Rule in a Drawing Scale, by J. Casartelli, Manchester, c. 1870

33. Roubicek Circular Slide Rule for Surveying, by Neuhöfer & Sohn, Vienna, c. 1870

34. Annular Slide Rule, by Elliott Brothers, London, c. 1875

36. Box Sextant with Integral Slide Rule, by Troughton & Simms, London, c. 1870

41. 2ft Gunter Rule, owned by Thomas Annand, English, 1683

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