Abney type pocket level
Object No. 2010/1/196
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 untimely death in August 2002. He specialised in Computer Architecture, Computer Logic and in particular the History of Computing. He was regarded as the world authority on Charles Babbage's Calculating Engines (instigating the building of the Difference Engine No.2 at the Science Museum London) and the Ankithera Mechanism and had extensive knowledge of calculators, analogue computers, logic, stereopsis, totalisators, clocks and time keeping and mechanical engineering.
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Summary
Object Statement
Pocket clinometer, Abney Mk.IV, brass / aluminium / glass / liquid, made by J.W. Handley Pty Ltd, Australia, 1942
Physical Description
The Abney Mk. IV pocket clinometer consists of a hollow rectangular tube base, with a semi-circular protractor screwed to one side. It is used to adjust the elevation of a gun when aiming artillery for particular ballistics. The protractor features an arched vernier scale and an adjustable magnifying lens through which the scale can be viewed. Linked to the protractor is a glass bubble level, which can be rotated 120 degrees using a stem winder. The bubble level is connected to a small metal arm with a scale at the tip. This arm slides along the protractor indicating the angle of elevation reached. The bubble level can be secured in place by a locking pin to ensure an accurate reading.
DIMENSIONS
Height
81 mm
Width
35 mm
HISTORY
Notes
Australian military use
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
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