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Description: | Audion AMPLIFIER 3 1/2 Volts HUDSON FILAMENT FOR SECOND & THIRD STEP ONLY PAT.FEB/16, 1908 (printed on back on a paper label). L.C.E. 61. (old departmental catalogue number on an old card box, discarded). MANU Henry W. McCandless and Company. 1908 67 Park Place in New York City, The United States of America. DES FOREST,Lee,de 1907 United States of America This is a triode valve designed by Lee de Forest and described in his patent application filed in January 1907 with the incorporation of a Hudson filament i.e. tantalum wire wrapped around a tungsten heater. The tungsten gave rigidity and the tantalum the high emmission rate. The valve has two lead in wires on the output side which pass through the pinched end of the round envelope. The input lead in wires are from a small Edison screw cap, candelabra size. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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