File:Practical electro-therapeutics and X-ray therapy - with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray (1912) (14734121826).jpg

Identifier: practicalelectro00mart (find matches)
Title: Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray
Year: 1912 (1910s)
Authors: Martin, James Madison, 1866-1947
Subjects: Electrotherapeutics X-rays Diagnosis, Radioscopic Eye Electric Stimulation Therapy X-Ray Therapy Ophthalmologic Surgical Procedures
Publisher: St. Louis : C.V. Mosby
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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while thenegative terminal (cathode) is to be connected in the same mannerto the negative prime conductor. Instead of being connected di-rectly to the metallic parts of the prime conductors, the wires fromthe terminals of the tubes are fastened to sliding rods or handles,which may be brought near to or in metallic contact with the primeconductors. By this arrangement a spark gap or resistance may 210 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY be placed in series with either terminal of the tube. Fig. 103 illus-trates the correct arrangement of the tube and shows how it is con-nected to the prime conductors, A and B being the spark gaps, asabove mentioned. When the machine is started with the prime conductors far apart,and the tube fails to light up, the prime conductors should bebrought close together until a vigorous spark passes between them,after which they must be widely separated, when the tube willusually light up, provided, of course, it is a static tube in goodcondition.
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Fig. 103.—Method of connecting an x-ray tube to a static machine. When the vacuum of the tube is quite low and the rays fail topenetrate the tissues, a y2- to 1-inch spark gap on the negative sideof the tube will raise the vacuum and considerably increase thepenetration. This spark gap should be placed at A, between thewire connecting the negative terminal of the tube and the negativeprime conductor. If the machine is kept dry and clean inside and out, it should doexcellent work every day in the year. The stronger the currentcarried through the tube, the greater will be the volume of x-radi-ance given off. The only way that this can be regulated is byregulating the speed of the revolving plates—the faster they re-volve, the greater will be the output of electricity and the strongerthe current through the tube. There seems to be current an opinion that a tube energized by a PHOTOTHERAPY 211 static machine is not likely to produce a burn. Men of small experi-ence have been heard to

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