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33 Surveyor's Circular Slide Rule

image of Surveyor's Circular Slide Rule

image of Surveyor's Circular Slide Rule

E. Roubicek designed this logarithmic slide rule about 1870 for the use of surveyors. It was made by Neuhöfer & Sohn, and is remarkable in that the engraved glass cursor has survived intact.

Engraved 'Log. Rechenschieber nach E. Roubicek; Neuhöfer & Sohn, Wien'.

Austrian, ca.1870.

Collection: Peter Delehar, London

Note: Neuhöfer & Sohn were primarily makers of surveying instruments and this exhibition also features a theodolite by them on the windowsill in the upper gallery.

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

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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