File:A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents - a pictorial system of teaching by clinical instruction plates with explanatory text (14570297878).jpg

Identifier: systemofinstruct00mone (find matches)
Title: A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice
Year: 1902 (1900s)
Authors: Monell, S. H. (Samuel Howard), d. 1918
Subjects: Vibration X-rays Diagnosis, Radioscopic Thermotherapy Electrotherapeutics X-Ray Therapy Vibration Diagnosis
Publisher: New York : E.R. Pelton
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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interrupters when on the opposite poles. The model pictured in my original volume early in 1897 is here greatly improved upon.The newer insulating handles are nine inches long and protect the operator from sparks whenregulating the powerful current. The long handle to the set-screw is a convenience. It is ofprime importance to have the rod fit tightly in the sleeve through which it turns and slides, sothat when the ball is placed in contact with the direct conductor of the sliding pole, or at anydesired distance from it, it will remain fixed. It is equally important to keep the brass partsof the interrupters polished. Oxidation upon the rod and terminal ball reduces conductivityand impairs the fine quality of the break. The same is true of the brass parts of the poles ofthe Static machine. Observe particularly the bend in the rod of the above modeL The advan-tage of this curve is easily seen in practice, and the author has not used a straight rod in anyof his interrupters since 1898.
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OPERATION OF X-HAY TUBES 81 can be Mglily excited witli a current that would be far too little dosagefor a large tube of tbe same relative resistance, because the moderatevoltage will break down the resistance of the small tube, and thevolume will be ample for the restricted area to be bombarded. Butspread out over the surface of larger electrodes and of the glass ofa large tube the volume of a small current makes too thin a bombard-ment to be effective, i.e., it is too small a dose for the tube. This explains why tubes must be adapted to the generator em-ployed, whether coil or Static machine. A pony will not do all thework of a big horse, and a four-inch spark-current will not do allthe work of a ten-, twelve-, or eighteen-inch spark-current. But to set up an intense bombardment a current must have thick-ness, volume, and quantity as well as driving voltage-force. A long,thin spark is not evidence of a good apparatus. The spark must showfat proportions. It must be thick. In a coil t

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