File:Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14735127226).jpg

Identifier: rntgenrayselectr00kass (find matches)
Title: Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy
Year: 1910 (1910s)
Authors: Kassabian, Mihran Krikor, 1870-1910
Subjects: Electrotherapeutics X-rays Phototherapy Radiology Radiotherapy
Publisher: Philadelphia & London : J.B. Lippincott Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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d coils. Spintermeter or Parallel Sparh-gap. — The length of the spark-gap va-ries with different voltages of current, the shape of the spark-gap, thewinding of the coil; the degree of the vacuum of the tube or its resistancecannot be ascertained because of the distance of the anode from cathode,and the varying sizes of the latter may cause more or less resistance. I have tubes that back up 4 to 5 inches (10 to 12.5 cm.) parallelspark-gaj), and yet produce cathode rays bluish in color and conical inshape, which are useless for penetration ; therefore the resistance of thetube does not always indicate the penetrability of the rays.^ C. Care of the Tube. Before using the tube see that it is absolutely free from dust particlesby employing some soft fabric as a wiper, exerting as little pressure onmain bulb as possible. The tube should always be perfectly dried byallowing the heat from a gas jet to pass around it. Wiener klin. Woch., 1900, No. 50.• See Part III., Chapter IV. Plate II.
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SELF-REGULATING X-KAY TUBE. CURRENT RUNNING )N WRONG DIRECTION. (Fig. 94.) THE EOI^TGEN EAY APPAEATUS. 187 The leads from the terminals of the secondary coil should be per-fectly insulated and sufficiently separated from one another through-out their entire length to prevent any sparking between them. These■wires must not come in contact with any conducting material, whichwould naturally permit of leakage of the current. The conducting wiresshould be sufficiently distant from the surface of the tube to j)reventpuncturing. Such a puncture is usually from a spark jumping throughthe glass wall from the conducting wire to the electrode within the tubeof opposite polarity. Puncture of the tube renders it useless, in somecases x^resenting an immediate change of color. Sparking occurs betweenthe anode and cathode from the inrush of air ; in other cases the injuredtubes may be worked for two or three hours after the accident. If theauxiliary bulb lights blue or red, the vacuum is low and a

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