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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but untilit is done, will be a difficult matter. Regulation of Our Tube. It is essential tothe success of a photograph that our self-regu-lating apparatus be accurately used. This canbe determined by watching the ammeter in theprimary and observing the color in our tube.A careful manipulation of this apparatus willoften prevent the breaking down of the vacuumin the tube. (See Fig. 46, diagram and explan-ation of 3-wire system, i. e.9 wrire to regulator.) When the vacuum begins to break, which willbe noticed by the purpling of the color in thetube and also by a lower pitch in the sing of thespark gaps, the current should be instantlyturned off. If this is not done, our vacuum willsoon break down, making our tube useless. Itshould also be remembered that, after the vac- 100 X-Ray and High-Frequency Currents uum begins to break, the tube is useless forfurther radiographic work at that sitting. The Plates. There are a number of makesof plates suitable for radiographic work. Most UJLlJLL)
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Fig. 46.—Illustrates 3 wire method of regulating X-Ray tube. AAArepresents multiple spark gaps which are regulated by the 3 slidingrods E E E. The outer spark gaps, which are simply series gaps,should only be used when the tube is of a very low resistanceor vacuum. The middle spark gap is used when the tube is of a veryhigh resistance. As this gap is made shorter, it sends current throughthe extension tube F on the X-ray tube, which current sets free agas inside of the main bulb, thus lowering the resistance. This sparkgap is just the same as the one shown on Fig. 37 and represents thedistance between A and B. When using the tube with a pointer,as shown on Fig. 37, it is necessary to turn the current off and keepmoving the pointer A a little closer or a little further away accordingto the desired regulation of tlie tube. When, however, the tube isconnected as shown by Fig. 4G, the operator does not have to shutoff the current, as the spark gap is adjusted by raising or loweringthe r

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