Fleming diode valve, 1889

Made:
1889 in London
inventor:
John Ambrose Fleming

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Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

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Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric Light
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric Light
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Three original thermionic valves invented by Sir John Ambrose Fleming, Edison and Swan United Electric Light Company,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Left: Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Original thermionic valve devised by Sir John Ambrose Fleming in 1904, using a filment lamp made by the Edison & Swan United Electric Light Company, London, in 1889

Original thermionic diode valve invented by Sir John Ambrose Fleming, made by the Edison & Swan United Electric Light Company, London, England, 1889.

These are the original valves used by Sir John Ambrose Fleming in his research during 1889 into the 'Edison Effect' - where an extra electrode connected to the positive end of the filament inside a carbon filament light bulb would create a small but measurable charge. After being stored in a cupboard for several years, the valves were once again put to use in 1904 during some experiments by Fleming, resulting in the invention of the two-electrode valve. A few years later American engineer Lee de Forest improved on Fleming’s valve to invent the audion, or triode, which could amplify as well as detect signals. A long and painful legal battle over patent rights for the thermionic valve followed between Fleming and de Forest.

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Details

Category:
Electronic Components
Object Number:
1925-814/3
Materials:
glass, metal (unknown), textile, wood (unidentified)
type:
thermionic valve
taxonomy:
  • component - object
credit:
Donated by Sir John Ambrose Fleming
status:
Permanent collection

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