Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,363 pages of information and 233,846 images on early companies, their products and the people who designed and built them.
1915 A lamp factory at Brimsdown, Middlesex, which had belonged to a German company, was taken over by the Public Trust Custodian.
Post-WWI Metropolitan-Vickers established an experimental laboratory to design radio receivers.
1922 Autumn: an advertising campaign presented the Cosmos crystal-type receiver; soon followed by valve-type Radiophones.
1924 development work in the research department produced the Cosmos Shortpath valve. This was a radical change in construction with smaller clearances between electrodes than previous valves.
1928 As part of the rationalization involved in joining with BTH to form AEI, Metropolitan-Vickers's merchandising businesses, including Cosmos, were transferred to Edison Swan Electric Co. The domestic appliance work was mainly transferred to Harcourts and the Cosmos works concentrated on the manufacture of lamps and valves.
1929 Edison Swan Electric Co took on valve production for the whole of AEI (presumably at Cosmos).
1934 Cosmos Lamp Works employees contributed to a fund after a mining disaster.