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Description: | Fleming Four-electrode valve. British patent 149, 422, 12 May 1919. (see also Fleming "Thermoinic Valve). 2 pairs of anodes (nickel) arranged symetrically around filament. Used as a detector. Bulb broken and almost entirely missing, anodes have therefore suffered also. | Format: | text/html | License: | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Rights holder: | University College London | Subjects: | Electrical engineering Electronic engineering | Source: | UCL Museums | Creator: | Marconi Osram | Identifier: | http://www.ucl.ac.uk/museums/objects/LDU... | Language: | en-GB | Format: | text/html | Go to resource |
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