- TitleFour-Electrode Valve
- Object CategoryValve
- DescriptionFleming Four-electrode valve. British patent 149, 422, 12 May 1919. (see also Fleming "Thermionic Valve). 2 pairs of anodes (nickel) arranged symetrically around filament. Used as a detector.
- Material
- Dimensions
- length: 140 mm
- CreatorMarconi Osram
- CollectionElectronic and Electrical Engineering
- Accession NumberLDUSC-EE-159
- Alternative Number158
- Administration NameUCL Science and Engineering Collections
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