Scientific Instrument Society 25th Anniversary Exhibition
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34 Annular Slide Rule
This is the only slide rule I have seen in the form of an annular ring. It is made of ‘electrum’, a nickel based alloy, by Elliott Brothers, London and is only 3mm thick. Both the slide and the stock have single and double radius logarithmic lines. The back of the slide is divided into 1000 equal parts, the zero of which coincides with 1 on the logarithmic scales and is visible through an aperture in the rear of the stock.
English ca.1875
See: Bulletin of the Scientific Instrument Society, No.5 1985, p.19
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
32. Circular Slide Rule, by Joseph Lamb, London, c. 1827
33. Roubicek Circular Slide Rule for Surveying, by Neuhöfer & Sohn, Vienna, c. 1870
36. Box Sextant with Integral Slide Rule, by Troughton & Simms, London, c. 1870