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Fleming diode

1905

"Q and I" detector, Edison and Swan

circa 1931

Cardew's voltmeter, patent, no. 147 (Ediswan)

1890

100 candle power 'Pointolite' electric Lamp

1923

E.H.T. Rectifier type 68508

1940-1957

1000 candle power 'Pointolite' electric Lamp

1883-1923

Deflectional electro-dynamometer, portable

1887-1900

Royal 'Ediswan' Christmas-tree lamp outfit

1935-1940

Miner's Safety Electric Lamp, 1886

1886

Ediswan AT.50 triode valve, McVitie Weston valve collection, 1906-1957

1906-1957

Fleming Oscillation Valve

1905

Fleming Oscillation Valve

1905

Electroconvulsive therapy machine

1940-1945

1000 Watt 220 volt 'Royal Ediswan' gas filled electric Lamp

1883-1923

60 Watt 220 volt 'Royal Ediswan' gas filled electric Lamp

1883-1923

'Royal Ediswan' metal filament lamp

circa 1915

Pointolite high intensity microscope lamp, by W. R. Prior and Co (Bishops Stortford, Herts), Santon Ltd and Edison Swan Electric Light Co., 155 Charing Cross Road, London, WC2, England, 1950-70.

Pointolite high intensity microscope lamp

1950-1970

Very early Edison and Swan 16CP carbon filament lamp

Edison and Swan 16cp carbon filament lamp

Two blowing irons, c. 1928

Two blowing irons, c. 1928

1928

Original Fleming diode, 60 S16, (RMW/A1A - McVitie Weston number), by The Edison and Swan Electric Light Company Limited, c.1904, invented by Sir (John) Ambrose Fleming and used by Fleming in October 1904.

Fleming diode

1904

transformer with bar through it. manufactured by Edison Swan United Electric Light Co, Manchester

Transformer with Bar

Letter from S. Bulmer to William Grey Walter, 3 December 1945

Letter from K.D.F. Townend to William Grey Walter, 22 July 1941

Letter from J.W. Ridgeway to William Grey Walter, 8 January 1943

Letter from S. Bulmer to William Grey Walter, 1 July 1946

Letter from Edison Swan Technical Services Dept to William Grey Walter, 19 December 1939

Letter from J.W. Ridgeway to William Grey Walter, 6 August 1943

Letter from S.N. Pocock to William Grey Walter, 4 May 1948

Letter from Norman Ellis to William Grey Walter, 1 March 1946

Letter from S. Bulmer to William Grey Walter, 28 April 1947

Passes on request for information from Medical Superintendent at Berry Wood Mental Hospital, Northamption about use of commercial salt solution instead of more expensive saline in ECT treatment. Attached response from Walter confirms commercial solutions above 10% will be fine.

Letter from K.D.F. Townend to William Grey Walter, 10 March 1942

Letter from J.W. Ridgeway to William Grey Walter, 23 March 1942

Letter from S.N. Pocock to William Grey Walter, 4 July 1947

Letter from J.W. Ridgeway to William Grey Walter, 23 July 1943

2 files, 49 items

Correspondence with the Edison Swan Electric Company

Letter from S. Bulmer to William Grey Walter, 21 March 1946

Letter from Norman Ellis to William Grey Walter, 18 February 1946

Letter from S.N. Pocock to William Grey Walter, 14 May 1947

Letter from J.W. Ridgeway to William Grey Walter, 10 March 1948

Letter from C.C. McCallum to Burden Neurological Institute, 3 September 1943

Letter from J.W. Ridgeway to William Grey Walter, 8 July 1941

Letter from K.D.F. Townend to William Grey Walter, 3 May 1943