. Radiography, X-ray therapeutics and radium therapy . ow be thrown well back, and the tube run cautiously for the first fewminutes after regulation. The regulation of the tube during use may be made automatic, if desired,by placing the wire F at such a distance from B that sparking (with conse-quent regulation) takes place whenever a certain degree of vacuum is distance may easily be determined by experiment with the individualtube in use. In the case of a tube which fails to regulate by the above method, it ispermissible to remove the lead from the cathode and attach it to the
. Radiography, X-ray therapeutics and radium therapy . ow be thrown well back, and the tube run cautiously for the first fewminutes after regulation. The regulation of the tube during use may be made automatic, if desired,by placing the wire F at such a distance from B that sparking (with conse-quent regulation) takes place whenever a certain degree of vacuum is distance may easily be determined by experiment with the individualtube in use. In the case of a tube which fails to regulate by the above method, it ispermissible to remove the lead from the cathode and attach it to the loop current should now be passed with extreme caution, the pressurebeing very carefully increased until the gas is expelled from the mica. In order to appreciate the degree to which regulation is taking place,the mica disc should be carefully watched while the shunt circuit is will be seen that the mica shows little flecks of red here and there, and whenthese appear, it is a sign that gas is being expelled. The time during which. Fig. 40.—Mica regulator. (C. Andrews.) A, Anti-cathode. C, Mica disc. E \ B, Cathode. J), Carbon. Fj Wire. the current should be passed through the regulator depends obviously uponthe degree of hardness of the tube, and the amount of softening which it isdesired to attain; but in any cage it is wiser to switch off: the current assoon as the fiery appearance is seen in the mica, swing back the regulatorwire, and test the tube ; and then to repeat the process of regulation ifnecessary. The regulator shown is merely a variation of the standard mica pattern,and is fitted to some smaller tubes on account of its greater conveniencewhere a 125-mm. bulb is employed. The mechanism is the same, but inplace of the hinged wire, a shaped wire is fitted on a spring and pin this wire rests in the position illustrated. To effect the wire is tilted with a piece of glass or wood until F B are in contact, whenthe eff
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