. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . emical, and this process will continue until the tube vacuumis lowered to a point where its resistance is slightly less than that throughthe regulating shunt, after which the discharge will, of course, passthrough the tube only, and will continue to do so until the vacuum risesagain through reabsorption of the gases by the cooled salt. By properadjustment of the swivel arm P, and the length of the spark gap betweenP and B, practically any desired degree of vacuum can, when thusobtained, be maintain
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . emical, and this process will continue until the tube vacuumis lowered to a point where its resistance is slightly less than that throughthe regulating shunt, after which the discharge will, of course, passthrough the tube only, and will continue to do so until the vacuum risesagain through reabsorption of the gases by the cooled salt. By properadjustment of the swivel arm P, and the length of the spark gap betweenP and B, practically any desired degree of vacuum can, when thusobtained, be maintained while the tube is being operated properly, anoccasional spark passing across the gap by a divergence of a part of THE X-RAY TUBE 425 the charge through the regulating shunt keeping the vacuum from risingabove the desired point. Care should be taken not to excite the regu-lator too vigorously at first, as the chemical may be heated too much,and as it continues to give off gas until cooled, the vacuum may belowered to such an extent that the tube cannot be used, for a time atleast. Fig. 344. Diagram illustrating the principle of regulating the vacuum of the auxiliary regulating bulb ofthe Queen self-regulating tube by an osmosis regulator. One objectionable feature of this regulator was the fact that the gasin the bulb D tended to disappear gradually through occlusion orotherwise, just as in any hard x-ray tube, so that after a time the resist-ance of the bulb D would become too high to permit regulation, or Fig. 345
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