Scientific Instrument Society 25th Anniversary Exhibition
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33 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