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ID number:  BIRRC-P0214
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Believed to be Pye Scientific Instrument Co. Ltd.
Title / Object name:  Electromagnet for original cavity magnetron
Object type:  Magnet
Place made:  Assumed to be Cambridge
Date made:  before 1940
Materials:  Iron and steel with copper windings
Measurements:  H 550 mm x W 650 mm x D 380 mm, 159.5 kg.

Stated to be a ‘Du Bois half ring’ magnet. The windings are in 8 sections with total resistance of 5 ohm. The spacing of the poles can be adjusted by loosening bolts and sliding on the base. See P0892.

Notes:  This is the electromagnet used by John Randall and Harry Boot to provide the magnetic field for the original cavity magnetron, which first operated successfully in the Physics Department of the University of Birmingham on 21 February 1940.

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