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R.I., Radio Instruments Ltd. was founded in 1915 in London. The address was 12 Hyde Street, New Oxford Street, London, W.C.1. The managing director was Joseph Joseph, chief designer was W.A. Appleton.
Radio Instruments made radio parts and professional receivers for consumers, but also for the Army, the Post Office and the BBC. The first equipment for talking movies in Britain was made by Radio Instruments. The company also worked together with Varley for some time.
In 1930 R.I moved to a new factory at 40 Purley Way, Croydon. In 1936 the company was split up. The instrument manufacturing department was acquired by AGI, Aeronautical and General Instruments, Ltd.
This company is now based in Poole, Dorset. They made sound ranging apparatus, signalling equipment, direction finding instruments, electrical navigational devices, and radio and broadcasting equipment. Radio Instruments remained a part of AGI. The last radios by Radio Instruments were made in 1948.
During the Second World War, the company made Agilux surveillance cameras for the Airforce and communication equipment for the Army and the Navy.
In 1946 AGI started producing Agilux cameras for the consumer market. The cameras were a commercial success until the 60s. All components, lenses and shutters were made by AGI. The company also made public telephones and other communication equipment. Periscopes and gun sights were made for the Navy and the Army.
The main focus is now on applications for military and civil aviation: meteorological systems, visual approach systems and speed log systems.
A part of Radio Instruments' products in 1923 (Wireless Weekly, August 1st, 1923)

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