Slide Rule, Circular

Reuse this image

Can I reuse this image without permission? Yes Tick

Attribute this image

https://collections.museumsvictoria.com.au/items/412298

Download images

Small (659 x 500, 28.5KB)
Medium (728 x 552, 23.3KB)

Conditions of use

Museums Victoria supports and encourages public access to our collection by offering image downloads for reuse.

Images marked as Public Domain have, to the best of Museums Victoria’s knowledge, no copyright or intellectual property rights that would restrict their free download and reuse. Images marked with a Creative Commons (CC) license may be downloaded and reused in accordance with the conditions of the relevant CC license. Please acknowledge Museums Victoria and cite the URL for the image so that others can also find it.

Images (1)

Videos (0)

Audio (0)

Item ST 35419 Circular Slide Rule - Brass & Steel, Kilpatrick, London, England, circa 1870

Summary

Circular slide rule, brass with steel movable scale, in maroon leather case, made by Kilpatrick & Co., London, circa 1870, and used at Melbourne Observatory.

Physical Description

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.