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ID number:  BIRRC-P0901
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Bell Telephone Labs
Title / Object name:  Cavity magnetron - Early U.S. version
Object type:  Cavity magnetron
Place made:  North America: USA
Date made:  1940-41
Materials:  Mainly copper and glass
Measurements:  Block diam. 5.0 cm, height 3.5 cm, Fin diam. 7.5 cm, overall length 21 cm

After the first commercial cavity magnetron E1189 was made in the U.K. by Mullard and operated on 29 June 1940, large-scale production was started in U.S.A. This exhibit looks identical to the famous first one made in U.K. and will be one of these U.S. magnetrons. It produced microwaves of wavelength 10 cm.

Inscriptions / Translations:  Western Electric Bell Telephone Labs
1259 M
Made in U.S.A.

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