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Circular Slide Rule - Kilpatrick, London, circa 1870 Object Reg. No: ST 035419

Circular slide rule, brass with steel movable scale, in maroon leather case, made by Kilpatrick & Co., London, circa 1870, and used at Melbourne Observatory.
Circular rule with two fixed scales of brass and one movable steel scale. Outer fixed scale is for simple multiplication and division, inner scale is related to the outer by the factor pi, to allow quick calculation of circular area, cylinder and spherical volume. The movable scale was originally manipulated with a key, fitting the rule's central hole, and a small hole in the moving scale. Complex tables are provided on the back of the rule giving conversion factors for weight per unit volume of various substances.
Acquisition Information:
Transfer from Victoria: Local Government Department Office of Trade Measurement (formerly Weights & Measures Branch)
Discipline: Technology
Dimensions: 2 cm (Height), 11 cm (Diameter)

More information

Tagged with: calculating devices, slide rules
Themes this item is part of: Melbourne Observatory Collection, Information & Communication Collection, Positional Astronomy at Melbourne Observatory, Weights & Measures at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872
Primary Classification: COMPUTING & CALCULATING
Secondary Classification: Calculating
Tertiary Classification: mechanical
Maker: Kilpatrick & Co, London, Middlesex, England, Great Britain, circa 1870
User: Melbourne Observatory, South Yarra, Victoria, Australia

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