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Model of BF3 neutron proportional Geiger counter
Model of BF3 neutron proportional Geiger counter, made by staff at 20th Century Electronics in 1954. In January 1953, the UKAEA at Harwell wanted 20th Century Electronics to produce a range of Geiger-Muller tubes to detect neutrons. The proposed tubes were different from ordinary GM tubes in that they had to be filled with a gas that would absorb neutrons - boron trifluoride, which was very dangerous to handle. 20th Century produced the tube commercially (they were the only people manufacturing such a type) and it sold widely all over the world.
Portion of engine counter
James Watt's Garret Workshop
1 Portion of engine counter, 9” x 3”, brass with 3 cardboard dials on
Presentaion model of proportional counter for use in a satellite
Presentation model of proportional counter for use in a satellite on circular plastic base; made by staff at 20th Century Electronics Ltd in 1958 and presented to the company's founder, Gilbert Tomes.
Ratio counter type D4107A made by Labgear, Cambrid
Ratio counter type D4107A made by Labgear, Cambridge, serial no. S.001, c1955.
Electronic counter from Hurstwood Park Hospital
Psychology, Psychiatry & Anthropometry
Electronic Counter, built in the EEG Department at Hurstwood Park Hospital, 1955.