This object is part of a collection relating to the history and development of computing and other information technology assembled by Assoc Professor Allan Bromley of Sydney University, comprising of calculators, mechanical and 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 rebuilt of DE2 at the Science Museum London) and the Ankithera Mechanism and had extensive knowledge on calculators, analogue computers, logic, stereopsis, totalisators, clocks and time keeping and mechanical engineering.

CM Co, c 1940

Used in WWII in military aircraft.

Calculator, Ballistic Correction No1, MK I, metal, made by CM Co, place of manufacture unknown, c. 1940

This mechanical calculator is mounted on a heavy metal plate. The plate has four holes which were used to mount the calculator inside an aircraft. At the top right side is a dial with two selectors and two numbered plates for setting the selectors. There are two metal information plates riveted to the large plate the array is mounted on. extending out the bottom and the right side of the dial are actuator arms that connect to five further actuators.

Made: 1935 - 1945

'Calculator, ballistic', 'No I. MK.I', 'CM Co', 'Reg No 154'

2010/1/1

1935 - 1945