Grace's Guide

British Industrial History

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BTH: Mazda

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March 1911.


July 1917.
March 1921.
Dec 1921.
November 1922.
February 1928
September 1928.
December 1928.
October 1931.
March 1932.
February 1937.
September 1937.
January 1939.
January 1944.
April 1946.
August 1946.
December 1950.
March 1953.
September 1953.
October 1953.

Note: This is a sub-section of BTH

A brand of electric filament lamps for cars and other uses, and electronic valves, made by BTH Rugby.

1911 BTH acquired licences for all of General Electric's drawn-wire light bulbs, which they produced under the Mazda trademark[1].

1911 Electrical Exhibition. Mazda lamps from 6 to 600 watts and other equipment[2].

WWI Using its experience in making filament lamps, BTH became a manufacturer of radio valves.

1921 A factory for producing glass, drawing and blowing glass for lamps and valves was made at Chesterfield. Westlake bulb-blowing machines were installed.

1926 Obtained a six months' contract for the supply of Mazda vacuum and gas-filled lamps to the Southern Railway.[3]

1928 BTH became part of the new AEI which concentrated valve work at Cosmos Lamp Works. BTH ceased valve making except for special purpose valves that it required for its production of non-domestic electronic equipment[4]

1937 British Industries Fair Advert for Lighting Products, including Mazda Mercra; Projector Lamps; Mazda Gas-filled and Mazda Vacuum Lamps; Light Tubes for Architectural Lighting; B. T. H. Lighting Equipment for Street, Industrial and Floodlighting; Maxdalux Floodlight Projectors; etc. (Stand No. Cb.607 and Cb.504) [5]

1946 Formed Glass Bulbs Ltd jointly with GEC; supplied the blown glass envelopes used by M-O Valve and as well as other valve makers[6].

See AEI: Lamps and Valves

See Also


Sources of Information

  1. The Engineer of 25th August 1911 p197
  2. The Engineer of 13th October 1911 p388
  3. The Engineer 1926/02/19
  4. Competition Commission report
  5. 1937 British Industries Fair Advert inside front cover; and p340
  6. [1] Competition Commission report