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    • 21. 发明专利
    • Improvements in glazed windows for observation and other purposes
    • GB572020A
    • 1945-09-19
    • GB1706643
    • 1943-10-18
    • BRITISH THOMSON HOUSTON CO LTDWILLIAM JOSEPH SCOTT
    • C03C27/02
    • 572,020. Uniting metal to glass by heat. BRITISH THOMSON-HOUSTON CO., Ltd., and SCOTT. W. J., Oct. 18. 1943, No. 17066. [Class 36] [Also in Groups X and XXIII] A window for an inspection aperture consists of a metal member 4 in which is hermetically secured by fusion a sheet of glass 2 the thermal co-efficients of expansion of the glass and metal being approximately the same from normal to fusion temperatures. The member 4 may be recessed or tapered for reception of the glass and is secured to the body of a tank &c. by screwing or welding. The glass may be given a lens or other shape by pressing 'with a die: and may be polished or ground after mounting. Fig. 8 shows a resilient frame of channel section having an attachment flange 10. The member 4 may be electroplated with cobalt or copper &c. or enamelled and if copper coated may be borated to assist adhesion of the glass. A suitable glass for use with iron or steel comprises SiO2,48; ZnO11; BaO,19; CaF2,5; Na2O+K2O+LiO,17 per cent.; for use with an alloy of 54 per cent. Fe 28per cent., Ni 18 per cent. Co or with the alloy described in Specifications 358,934 or 449,807 [both in Group XXIII], the glass may comprise SiO2, 64.1 or 68.5! B2O3, 25.3 or 30; Al2O3, 1.8 or 0.0; Na2O+K2O+LiO, 8.5 or 1.5 per cent. The Provisional Specification also refers to a glass comprising SiO2,45; BaO,15; ZnQ,15 CaF2,5; K2O,14; Na2O, 6 per cent. Specification 462,600, [Group XL], also is referred to.
    • 23. 发明专利
    • Improved circuit arrangements for operating electric discharge lamps
    • GB539465A
    • 1941-09-11
    • GB506640
    • 1940-03-19
    • BRITISH THOMSON HOUSTON CO LTDWILLIAM JOSEPH SCOTT
    • H05B41/06
    • 539,465. Discharge lamps. BRITISH THOMSONHOUSTON, CO., Ltd., and SCOTT, W. J. March 19, 1940, No. 5066. [Class 39 (i)] [Also in Groups XXXV and XXXVII] In a circuit for operating lowpressure discharge lamps of the type comprising thermionic filamentary cathodes which are preheated to 'initiate the discharge, the heating current being discontinued during the normal operation of the lamp, a switching arrangement is provided for putting the filamentary cathodes in circuit with the source of heating current and subsequently connecting the ends of the filaments together so that all parts thereof are at the same potential. The switch may be electromagnetically operated, or of the thermal responsive type such as described in Specification 532,490, [Group XXXVII]. The arrangement described is a glow discharge device comprising two fixed contacts 5, 6 and two bimetallic elements 3, 4 carrying contact member 7, 8. The contacts 6, 8 and 5, 7 are connected to the ends of the filamentary cathodes of a discharge lamp operating on A.C. When the operating current is first supplied, the glow discharge between the elements 3, 4 causes these elements to deflect until the contacts 7, 8 short circuit the glow discharge causing a relatively heavy heating current to pass through the filaments, and allowing the elements to cool, whereby they return to their normal position closing the contacts 6, 8 and 5, 7.
    • 27. 发明专利
    • Improvements in and relating to vacuum tight seals for the leading in conductors of electric discharge lamps
    • GB465475A
    • 1937-05-06
    • GB3071335
    • 1935-11-06
    • BRITISH THOMSON HOUSTON CO LTDWILLIAM JOSEPH SCOTT
    • H01J5/32
    • 465,475. Uniting metal to vitreous material by heat. BRITISH THOMSONHOUSTON CO., Ltd., and SCOTT, W. J. Nov. 6, 1935, No. 30713. [Class 36] In the manufacture of a high pressure vapour electric discharge lamp of the kind wherein the envelope consists of a tube of quartz or high melting-point glass of relatively small bore and contains an electrode having a composite lead-in conductor comprising a section of thin and fragile metal ribbon connected to the shank of the electrode, the electrode is maintained in the desired position within the envelope prior to the sealing operation by means of a bead or tube of fused silica engaging the inner end wall of the envelope and located or fused around at least a part of the shank of the electrode so as to counteract bending of the electrode with or about the metal ribbon, a portion at least of the silica bead or tube being subsequently incorporated in the seal effected by the fusing down of the end wall portion of the envelope. A thicker lead-in conductor may be secured to the end of the metal ribbon remote from the shank of the electrode, and the silica bead or tube may surround the entire length of the ribbon and preferably extends also over a part ofthe thicker lead-in conductor. The thickness of the metal ribbon is preferably less than 0À008 inch. In the example, a quartz tube 1 which is closed at one end has an electrode 2 near that end provided with a tungsten shank 4 connected to a molybdenum ribbon 3 which, at its other end, is connected to a thicker molybdenum section 5. A tube 6 of fused silica fitting fairly tightly within the tube 1 is located closely around the entire section 3 and extends over part of the sections 4, 5. A co-operating electrode 2 has corresponding lead-in sections 3 -5 located within a silica tube 6 . The open right-hand end of the tube 1 is connected to an exhausting pump and then to a supply of the requisite-filling gas, after which the portions of the tube 1 surrounding the tubes 6, 6 are heated to fuse them together, and the tubes 6, 6 will, in turn, fuse down on to the sections of the composite conductor which they surround. The excess end portions of the tube 1 are broken off to receive metal terminal caps which are connected to the outer ends of the wires 5, 5 . An additional hole or holes may be provided in the fused silica tube or bead to receive a further molybdenum lead or leads. Alternatively, a further lead or leads may be sealed in the space between the tube or bead and the lamp envelope. A quantity of mercury may be inserted in the tube 1 before sealing. Specifications 418,906, [Group XI], and 455,101, [Group XL], are referred to.