The Edison and Swan Electric Light Company Limited was a manufacturer of incandescent lamp bulbs and other electrical goods. It was formed in 1883 with the name Edison & Swan United Electric Light Company with the merger of the Swan United Electric Company and the Edison Electric Light Company.

Thomas Edison Thomas Alva Edison (February11, 1847October18, 1931) was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventions, ...

established the Edison Electric Light Company in 1878.

Joseph Swan Sir Joseph Wilson Swan Fellow of the Royal Society, FRS (31 October 1828 – 27 May 1914) was an English physicist, chemist, and inventor. He is known as an independent early developer of a successful incandescent light bulb, and is respon ...

established the Swan United Electric Light Company in 1881. Swan sued Edison in the UK, claiming patent infringement; this was upheld by the British courts. In 1882, Edison sued Swan, claiming infringement of his 1879 U.S. patent; however, the Edison Company believed their case would be jeopardized if Swan could demonstrate prior research and publication. Subsequently, in order to avoid uncertain and expensive litigation, the two companies negotiated a merger. The glass bulbs sold in Britain were of Swan's design, while the filaments were of Edison's. From 1887 or earlier Sir

Ambrose Fleming Sir John Ambrose Fleming (29 November 1849 – 18 April 1945) was an English electrical engineer who invented the vacuum tube, designed the radio transmitter with which the first transatlantic radio transmission was made, and also established ...

was an adviser to the company, and conducted research at Ponders End. The company had offices at 155

Charing Cross Road Charing Cross Road is a street in central London running immediately north of St Martin-in-the-Fields to St Giles Circus (the intersection with Oxford Street), which then merges into Tottenham Court Road. It leads from the north in the direc ...

, London, and factories in

Brimsdown Brimsdown is a neighbourhood of eastern Enfield in the London Borough of Enfield, north London, on the west side of the mid-to-lower Lea Valley. Geography The east of Brimsdown, that is, east of the eastern Lea Valley line is one of the boroug ...

Ponders End Ponders End is the southeasternmost part of Enfield, London, Enfield, North London, north London, England, around Hertford Road west of the Lee Navigation, River Lee Navigation. It became Industrial suburb, industrialised through the 19th centur ...

and

Sunderland Sunderland () is a port City status in the United Kingdom, city and metropolitan borough in Tyne and Wear, England. It is a port at the mouth of the River Wear on the North Sea, approximately south-east of Newcastle upon Tyne. It is the most p ...

. In 1928, the company was acquired by

Associated Electrical Industries Associated Electrical Industries (AEI) was a British holding company formed in 1928 through the merger of British Thomson-Houston (BTH) and Metropolitan-Vickers electrical engineering companies. In 1967 AEI was acquired by GEC, to create the UK ...

. In 1956, a new cathode ray tube plant was opened in Sunderland. The company was renamed Siemens Ediswan following the takeover of Siemens Brothers by AEI in 1957. In 1964, AEI merged its lamp and radio valve manufacturing interests with those of

Thorn Electrical Industries Thorn Electrical Industries Limited was a British electrical engineering company. It was listed on the London Stock Exchange, but merged with EMI Group to form Thorn EMI in 1979. It was de-merged in 1996 and became a constituent of the FTSE 100 ...

to form British Lighting Industries Ltd.

Ediswan Valves

Edison Swan (or later Siemens Edison Swan) produced a wide range of

vacuum tube A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. It ...

s and

cathode ray tube A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a ...

s under the names "Ediswan" or "Mazda" and the 1964 Mazda Valve Data Book claimed: "Professor Sir. Ambrose Fleming... was Technical Consultant to the Edison Swan Company at the time. It was this close co-operation between University and Factory which resulted in the first radio valve in the world." Ediswan still survives as a manufacturer of valves (located in Bromsgrove England).

References

External links

* http://www.gracesguide.co.uk/Edison_Swan_Electric_Co * http://www.vintage-technology.info/pages/ephemera/vemazda.htm {{Thomas Edison Electrical engineering companies of the United Kingdom Lighting brands Vacuum tubes General Electric Company Associated Electrical Industries Manufacturing companies established in 1883 Manufacturing companies disestablished in 1964 1883 establishments in England 1964 disestablishments in England

Ediswan Valves

See also

References

Further reading

External links