GB100959A - Improvements in Electric Vacuum Devices with Incandescent Cathodes. - Google Patents

Abstract

100,959. Forest, L. de. July 22, 1915, [Convention date]. Vaccum tubes.-The exhausted container of an audion " for generating oscillating currents of considerable power is made of metal so as to serve as anode and is placed within and in electric connexion with a vessel which is exhausted or filled with a sealing-medium, such as mercury, castor or other oil, or glycerine, serving also to conduct heat from the container. In one construction, the container 7, Fig. 1, and outer vessel 6 are of steel and of elliptical section, and are spaced apart by stops 8. A disk 9 of glass or other insulating-material, covered by the liquid, rests on a flange on the container and is fitted with glass or other tubes 10, 11, 12 for the passage of the leading-in wires and for exhausting and sealing. The grid wire 14 is wound on the bent tube 10, which also supports the lower end of the cathode flament. A terminal is attached to the outer vessel 6. An electric fan, refrigerating-pipes, or water supply may be employed to cool the outer vessel. In another construction, the container is turned inwards at its mouth to take a conical stopper, and is corrugated near its upper end so as to make contact with the outer vessel. When the intermediate space 24, Fig. 5, is exhausted, the container is corrugated throughout so as to conduct heat to the outer vessel. An exhaustion tube 23 may be sealed by melting lump solder in a bend 25. According to the Specification as open to inspection under Sect. 91 (3( (a) a container may be of non-metallic material such as glass, or of metal rendered air-tight by a refractory enamel. This subject-matter does not appear in the Specification as accepted.