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2010/1/165 Cylindrical navigational slide rule with case, Bygrave type AML Position Line Mark IIA No 546. metal / paper / rubber, made by Henry Hughes & Son Ltd, used by Allan Bromley, England, c.1930. Click to enlarge.

Cylindrical navigation slide rule

Made by Henry Hughes & Son Ltd in London, Greater London, England, United Kingdom, Europe, c. 1930.

This object is part of a collection relating to the history and development of calculating devices assembled by Assoc Professor Allan Bromley of Sydney University, comprising mathematical instruments, slide-rules, mechanical and electronic calculators, electronic analogue computers, computer components, kit computers, education computers, and associated ephemera.

Allan Bromley was a lecturer and researcher at the University of Sydney Basser Department of Computer Science from 1978 until his unt...

Summary

Object No.

2010/1/165

Object Statement

Cylindrical navigational slide rule with case, Bygrave type AML Position Line Mark IIA No 546. metal / paper / rubber, made by Henry Hughes & Son Ltd, used by Allan Bromley, England, c.1930

Physical Description

The slide rule is a Bygrave type position line navigation calculator. It is cylindrical in shape and consists of three concentric cylinders. The outermost cylinder, is made from a course cream coloured plastic and features two pointers as well as a number of tables and formulas which assist navigators to obtain position lines from sextant observations. The middle cylinder contains logarithmic cosies and scales, while the inner cylinder features a long spiral of logarithmic tangents. Both are made of a smoother, cream coloured plastic.
There is a small plastic plaque attached to the outer cylinder. Handwritten on the plaque in blue pen is "LAT / HA/ DEC / C / y / Y / Az / ALT"
The top of the cylinder is capped by an octagonal red/brown plastic. The cap is labelled "A.M.L. Position Line Slide Rule, Mark IIA, No.546 Patent No.162895". The base is also capped with a hollow, round, red/brown plastic, with grooved edges.

The container for the slide rule, consisting of case and lid, is also cylindrical and is made of a black metal.

History

Used

Bromley, Allan 1978-2002

Source

Credit Line

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

Acquisition Date

20 January 2010

Cite this Object

Harvard

Cylindrical navigation slide rule 2019, Museum of Applied Arts & Sciences, accessed 20 August 2019, <https://ma.as/373041>

Wikipedia

{{cite web |url=https://ma.as/373041 |title=Cylindrical navigation slide rule |author=Museum of Applied Arts & Sciences |access-date=20 August 2019 |publisher=Museum of Applied Arts & Sciences, Australia}}

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