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2010/1/509 Circular slide rule with pouch, instruction booklets and leaflets, Gilson A-B, duplex, multi-cursor, metal / plastic / paper, made by Gilson Slide Rule Co, Stuart, Florida, United States of America, 1940. Click to enlarge.

Gilson A-B circular slide rule

Made
This slide rule is from the collection of calculating instruments assembled by Assoc. Professor Allan Bromley. His collection provides examples of most forms of calculating devices made from the early 18th to the late 20th centuries. Slide rules constitute a substantial proportion of this collection.

Over the 19th and much of the 20th centuries the slide rule was the primary instrument for calculation used by many people engaged in the trades and in engineering. Although originally invented …

Summary

Object No.

2010/1/509

Object Statement

Circular slide rule with pouch, instruction booklets and leaflets, Gilson A-B, duplex, multi-cursor, metal / plastic / paper, made by Gilson Slide Rule Co, Stuart, Florida, United States of America, 1940

Physical Description

Slide rule, Gilson A-B, circular, duplex, multi-cursor, a double sided disk of white enamelled metal with a large central bolt that hold two pairs of cursors on either side. One side is called the "Atlas" Slide rule and the other is the "Binary" Slide Rule. It is housed in a leatherette sheath and comes with instruction booklets for both types. Included in an envelope (dated 1953) are leaflets for the two types of slide rules.

The Binary Slide rule side has multiple scales from the standard set arrayed around the circle of 63cm circumference (at the outer edge) for greater precision.
Scales are: from the outer ring: C, CI (C inverted), A, K, L, LL4, LL3, LL2, LL1, B, and then a set for machinists including scales in mm and 64ths of an inch.

The Atlas Side Rule has three scales on it: the outer one is effectively 62cm (20 inches) long, the main one is a long spiral giving a precision equivalent to a straight scale 18.24 metres (60 feet) long, and the inner scale appears to be use for counting rotations around the long coil.

Marks

Name on slide rule, on observe, in upper center, painted in black ' Atlas Slide Rule ', on reverse, in upper center, printed in black ' The Binary Slide Rule / Made in the USA / Copyrighted 1940 ' in small text.

Manufacturer and name on one instruction booklet, on cover, printed in black ' Instructions for using the Binary Slide Rule / Printed in U. S. A. / Gilson Slide Rule Co., Box 993, Stuart, Fla. / (Slide Rule Makers Since 1915) '. On second instruction booklet, printed in black ' Instructions for using the Atlas Slide Rule / Printed in U. S. A '.

Stamp, notes and address on envelope, in upper left corner ' After 10 days return to Gilson Slide Rule Co., Box 993, Stuart, FLA.', in upper center ' Stuart, FLA / 6 pm Apr 20, 1953 ', in lower center ' J. M. Fenton / 22 Vandon Court / Petty France / London, S.W.L, England. '.

White paper lable on pouch, handwritten in black ' Bromely 1983-9 '.

Dimensions

Height

5 mm

Width

230 mm

Production

Notes

Mfr: The Gilson Slide Rule Co, Stuart, Florida, USA.

Source

Credit Line

Donated through the Australian Government's Cultural Gifts Program in memory of Associate Professor Allan Bromley, 2010

Acquisition Date

19 January 2010

Cite this Object

Harvard

Gilson A-B circular slide rule 2021, Museum of Applied Arts & Sciences, accessed 26 October 2021, <https://ma.as/382984>

Wikipedia

{{cite web |url=https://ma.as/382984 |title=Gilson A-B circular slide rule |author=Museum of Applied Arts & Sciences |access-date=26 October 2021 |publisher=Museum of Applied Arts & Sciences, Australia}}