Used by the Australian Army

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.

British military sold on to Australian military

Military slide rule, range taking Mk I, plastic, made by Reliance (Name Plates) Ltd, England, 1937

White plastic slide rule with scales for distance in yards and angles in "mils" which are thousandths of a radian. Bromley describes it as " 5 inch plastic artillery slide rule. Effectively comprised of A and B scales with the results read against a D scale on the stock"

Made: 1937

Reliance (Name Plates) Ltd. 1937. Crown Copyright Reserved

Broad Arrow inside "D"

2010/1/194

1937

35 mm

3 mm