. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . it contained. When the exhaustion in thebulb had progressed to a certain point, the smaller tubewas allowed to cool, and in so doing it absorbs the lasttrace of moist vapor in the tube. When the tube becomestoo high, the annex containing the potash is heated byapplying a lamp or by causing the current to enter the tubethrough a platinum wire embedded in the potash and fusedinto the glass, and thereby causing it to
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . it contained. When the exhaustion in thebulb had progressed to a certain point, the smaller tubewas allowed to cool, and in so doing it absorbs the lasttrace of moist vapor in the tube. When the tube becomestoo high, the annex containing the potash is heated byapplying a lamp or by causing the current to enter the tubethrough a platinum wire embedded in the potash and fusedinto the glass, and thereby causing it to give up some of itscontained moist gas, again lowering the vacuum. The most commonly used type of this tube is that devisedby INIuller. It is very much like the preceding, but containsa piece of palladium wire as seen at i? in Fig. 15, fusedthrough the small tube instead of containing caustic potash. 70 GENERAL CONSIDERATIONS UPON RADIOLOGY The tube is filled with hydrogen before it is exhausted, tothe complete exclusion of all of the atmospheric air. Thepalladium is kept cold while the tube is being exhaustedand sealed. The tube depends for its action upon the fact Fig. Queen self-regulating tube in action. that palladium possesses the peculiar quality of absorbing960 times its own bulk of hydrogen at ordinary temperaturesand liberating it when heated. Self-regulating Tubes. The preceding type of tube hasbeen developed into an exceedingly ingenious self-regulating APPARATUS 71 tube, which has the facuky of hberating some of the gas inthe potash automaticaUy whenever the vacuum in the maintube becomes higher than a certain previously set mark,and discontinuing the hberation of the gases as the vacuumassumes the normal. Of these tubes, the Queen self-regu-lating is a very. ^ good example, and as the principle in all Fig. 17.
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