. The American journal of roentgenology, radium therapy and nuclear medicine . ound a carefully cleaned tungstendisc in a vacuum.^ Copper and tungsten do - Coolidge. Metallic Tungsten and Some of ItsApplications. Trans. Am. Inst. Elect. Engrs., 31 (i),1219-28, 1912. Manufacture of the Coolidge A-Rav Tube 257 not alloy with one another, but under theconditions employed, the melted copper wetsthe tungsten and adheres firmly to it whenit solidifies. This process assures good ther-mal conductivity between the tungsten andthe copper. The finished anode heads areelectrically welded to a rod of coppe
. The American journal of roentgenology, radium therapy and nuclear medicine . ound a carefully cleaned tungstendisc in a vacuum.^ Copper and tungsten do - Coolidge. Metallic Tungsten and Some of ItsApplications. Trans. Am. Inst. Elect. Engrs., 31 (i),1219-28, 1912. Manufacture of the Coolidge A-Rav Tube 257 not alloy with one another, but under theconditions employed, the melted copper wetsthe tungsten and adheres firmly to it whenit solidifies. This process assures good ther-mal conductivity between the tungsten andthe copper. The finished anode heads areelectrically welded to a rod of copper whichis to extend out through the anode arm ofthe tube and support the radiator. The plat- many of the parts are small; and in order toobtain the desired size and distribution ofenergy over the focal spot, the relative posi-tions and shapes of these various parts mustbe nicely regulated. The tungsten terminalsof the spirals in assembled cathodes arewelded in place by arcing in hydrogen weld is made on the cathode cup andthe other on the metal leading-in wire. This. Fig. 4. Various Steps ix the Forming of Fila-ments FOR Cathodes. A, spool of tungsten wire;B, Mandrel with filament wound on it; C, form(unassembled) for high firing of filament; D,low fired filament; E, fine focus filament afterfiring in form; F, medium focus filament; G,broad focus filament. inum or alloy sleeve by means of which theseal between anode and glass is made issilver-soldered to the copper rod. CATHODE ASSEMBLY. (a) Preparation of Cathode Spirals. Forall cathode filaments, tungsten wire ch diameter is used. The first op-eration in making a filament spiral is thewinding of the wire on a conical mandrel ofspecial tungsten steel. Before the spiral isremoved from its mandrel, it is given ananneal in hydrogen in an electric spirals thus prepared are nextclamped in molybdenum forms and heatedin an electric furnace to a temperature ofi6oo°C. in an atmosphere of hydrogen
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