OUR PRODUCT MANUFACTURERS — ediswan

Edison Swan of 36-7 Queen Street, London (1908) Joseph Swan experimented with incandescent lamps but lacked an adequate vacuum pump. He heard about a newly invented air pump known as a Sprengel pump and applied this to his experiments. 1877 Thomas Edison turned his attentions to electric lighting towards the end of 1877. He believed that commercially successful lighting needed to have similar characteristics to the existing gas lighting. His early experiments using carbonized paper and carbon were failures. The lamp usually cited as his first success was made on 19th October 1879 but the carbonized cotton used as the...

Professor Sir. Ambrose Fleming comissioned the preparation of his prototype diode valve by the Edison Swan (later Mazda) factory at Ponders End near London in 1904.  Professor Fleming was Technical Consultant to the Edison Swan Company at the time which may be why he did not use A C Cossor. .  It was this close co-operation between University and Factory which resulted in the first radio valve in the world." The Ediswan/Mazda company had a convoluted ownership path being in turn owned by AEI, BTH and Thorn.  Valves were preduced in the Ediswan works but some were made in France through...