Identifier: practicalpointsi00judd (find matches)
Title: Practical points in the use of X-ray and high-frequency currents
Year: 1909 (1900s)
Authors: Judd, Aspinwall
Subjects: X-rays Electrotherapeutics Radiography X-Rays Radiography
Publisher: New York : Rebman Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 36.—Above figure shows high resistance tube, full hemisphere infront of the target showing very light green, with numerous greenspots and a tendency to discharge from the cords with which the tubeis connected.
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Fig. 37.—Represents a self-regulating X-ray tube. When adjusted fora certain parallel spark gap, if its resistance becomes higher than theparallel spark gap it was set for, the spark will pass between Aand B so that the current is conducted into the small extensiontube having a chemical which, when the electricity passes through it,gives off a gas which lowers the resistance of the tube. When usingthe tube as a pointer, as shown on Fig. 37, it is necessary to turn thecurrent off and keep moving the pointer A a little closer or a littlefurther away according to the desired regulation of the tube. When,however, the tube is connected as shown by Fig. 46, then the operatordoes not have to shut off the current, as the spark gap is adjusted byraising or lowering the rod E of the middle spark gap. X-Ray Tubes 71 soda glass, which allows the X-ray to passthrough it easily. The rest of the bulb, being oflead glass, does not permit the X-ray to passthrough. There are lead glass shields madewh

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