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.

This device was probably used in Seismology to indicate the geographical point at which a seismic charge is set off so as to measure the echo responses from the ground to that shot.

Input/Output Inc, Houston, Texas
Made in England, UK by Fearns Calculators, Dunston, Gateshead,

Only reference found indicates a function in Seismology. It indicates the geographical point at which a seismic charge is set off for measuring the echo responses from the ground to that shot.

Circular slide rule with case, Shot Point Indicator, plastic. designed by Input/Output Inc, Houston, Texas, United States of America, made by Fearns Calculators, England, 1960-1980

Slide rule, Shot Point Indicator, four concentric disks in white plastic with numbers engraved onto edges/surfaces, with case, plastic.

Probably used in Seismology
The outer disk - 7.25" Disk shows data for the Ground Station
Middle Disk - 6.70" Disk shows data for RLS Input
The Inner Disk - 5.87" Disk shows Recording Channel data

Made: 1960 - 1980

Input/Output Inc, Houston, Texas - Shot Point Indicator
Made in England by Fearns Calculators, Dunston, Gateshead,

2010/1/138

1960 - 1980

198 mm