- [nb-NO]Title[nb-NO]Four-Electrode Valve
- Valve
- [nb-NO]Description[nb-NO]Fleming 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.
- [nb-NO]Material[nb-NO]
- [nb-NO]Dimensions[nb-NO]
- length: 140 mm
- [nb-NO]Creator[nb-NO]Marconi Osram
- Electronic and Electrical Engineering
- [nb-NO]Object number[nb-NO]LDUSC-EE-159
- 158
- UCL Science and Engineering Collections
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