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 Antikythera Mechanism and had extensive knowledge of calculators, analogue computers, logic, stereopsis, totalisators, clocks and time keeping and mechanical engineering.

Sectional model of an electro-mechanical desktop calculator, National Class 31 accounting machine, wood / metal, maker unknown, Australia, 1965-1978

This is an exploded section of a National Class 31 Accounting Machine, used as a didactic display model. The Class 31 was a versatile machine; it could be put to service in all accounting fields.

This machine is marked: 'This model is the property of L. Halamy. F. E. D. N. C. R. H. Office North Sydney. This cutaway model of the basic class 3000 31, 32 and 37 A accounting machine has been used as a teaching aid in the technical school between years 1965 - 1978 in Turella'.

Made: 1965 - 1978

This model is the property of L. Halamy. F. E. D. N. C. R. H. Office North Sydney

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1965 - 1978