Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14571441180)

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

Text Appearing Before Image:

Fig. 92.—Osmosis regulating tube of Gundelach. X-ray tube. When it is desired to lower the vacuum in the tube, the pro-jecting platinum tip is heated to redness in a Bunsen flame. The heatedplatinum permits the passage of gas through its pores into the tube, thuslowering the vacuum. This process may be resorted to without inter-fering with the working of the tube; the degree of vacuum can thus begauged by the color of the fluorescence. A low vacuum is manifestedby a bluish tint, indicating that the heating of the platinum shouldcease. Mechanical Regeneration. —This method allows of a variance in thepenetration value, by adjusting the distance between anode and cathode.Its employment, however, is inapplicable, as it entails the sacrifice ofmany tubes and requires an adept in manual dexterity. Plate I.

Text Appearing After Image:

SELF-REGULATING X-RAY TUBE. OPERATING PROPERLY.(Fig, 93.) THE EONTGEN RAY APPARATUS. 185 EJedro-stailc Bvgencration is foiiuded on the principle that the dis-charge passing through a focus tube is influenced by the charge generatedby electro-static induction on the outer surface of the tube. To accom-plish this, the neck of the tube in the plane of the cathode edge iscovered with strips of tin-foil, and by connecting it by an adjustablespark-gap with the ground or wire leading to the cathode. The methodgives some promise of usefulness, but the serious drawback is, the con-stant danger of perforation of the tube. Water-cooling tubes are those in which a stream of running waterpasses around the anode, maintaining it in a cool condition, thus notinterfering with the degree of vacuum in the tube. In other tubes theremay be two anodes and two cathodes, which are adapted for the use ofthe alternating current. B. The Quality of the X-Rays. The qualities of the X-rays depend largely upon the

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1910

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