- Valve
- DescrizioneFleming 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.
- Documentation- Thermionic Valve and its Development in Radiotelegraphy and Telephony
- Materiale
- Dimensioni
- length: 140 mm
- CreatoreMarconi Osram
- Electronic and Electrical Engineering
- Numero oggettoLDUSC-EE-54
- 53
- UCL Science and Engineering Collections
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