File:American X-ray journal (1901) (14758135285).jpg

Identifier: americanxrayjour9101unse (find matches)
Title: American X-ray journal
Year: 1902 (1900s)
Authors:
Subjects: X-Rays Radiography
Publisher: St. Louis : American X-Ray Publishing Co.
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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coil. There is another tube for stereopticvision designed by Caldwell. By usingtwo sources of x-rays in the same tubeeach eye views independently the shad-ow, with the result that the picturestands out distinctly. It is thought thatthe fluoroscopic examination of frac-tures especially may be made muchmore successfully, permitting immediateexamination by this method with a fluor-oscope having a special rotating shutter. Reduction of Vacuum. When the vacuum has become toohigh in consequence of much use, cer-tain focus tubes had to be heated witha spirit lamp around the cathode oraluminium electrode until they againemit x-rays. This must not be done while the current is passing through thetube, the operator may receive shocksfrom the apparatus, or the lamp couldexplode. If the degree of exhaustionof vacuum in the common focus tube orthe New Improved German tube is toohigh, sparks will often play around thetube; to avoid this we use a round me-tallic disk at the anode (See Fig. 7), and 4-
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Fig. 7. Disk at anode, not shown. get a steady light, that, by proper ad-justment, may be increased to a brilliantglow, thus affording of any degree ofpenetration. A very simple way to get a vacuumsuited to our apparatus is by a handregulator or a temporary regulator maybe made by twisting a bit of wire on astick. This way we may always causeseveral sparks to pass into the chemicalbulb, place the regulator or short cir-cuiting rod in contact with the platinumloop at the anode and cause the sparkto pass to the cathode end of the tube.A very few sparks, sometimes one ortwo, should lower the vacuum sufficient-ly for the time, being. In discussing the problem of theproper manipulation of the vacuum ofa tube to get good results and good L056 THE AMERICAN X-RAY JOURNAL. effects, we have to consider also theraising of the vacuum electrically in caseof necessity. As stated already, thevacuum of a tube is constantly chang-ing and the quantity differs occasionallyand can never be relied upon to

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