File:American X-ray journal (1903) (14571514079).jpg

Identifier: americanxrayjour1213unse (find matches)
Title: American X-ray journal
Year: 1903 (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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ectly to the body. When the connection between the out-side coatings of the Leyden jars is madeby a heavy copper wire which forms ahelix, and this helix is the primary wireof a coreless inductorium, the small re-sistance of the primary interferes verylittle with the amplitude of the oscilla-tions, and each oscillation induces a cor-responding oscillation in the secondarycircuit which may be applied to the bodyas required. This apparatus is known as end of the coil carries a distributing disk.When two coils are used and the patientplaced between these disks a strong oscil-lating glow passes from the disks to thepatient. This form of resonator is ex-ceedingly powerful and is used with goodeffect in all cases in which hyperstaticcurrents are indicated. The third form of apparatus for highfrequency currents is the DArsonval coil.It consists of a spiral coil which is madea part of the primary circuit from theLeyden jars. The electrodes are attachedat each end of this coil. The oscillations
Text Appearing After Image:
HYPERSTATIC MACHINE. Piffards hyperstatic. It was illustratedwith a machine kindly loaned by Dr. H.Preston Pratt. A second device for creating oscillationsof very great amplitude is known as theOudin resonator. In the resonator theprimary current from the outer coatingof the Leyden jar is conducted thru thelower portion of a coil of heavy copperwire. This starts up oscillations in thelarge coil and when those are properly at-tuned to the coil fchey are much ampli-fied al the free end. Tins was illustratedby a coil kindly loaned for the purposeby Mr. Scheidel. An arm at the upper obtained thru the electrodes are of muchlower potential than those from eitherthe hyperstatic or the Oudin resonator,but in spite of this the current is consid-erable when the resistance of the elec-trode-circuit is small. This was also il-lustrated by a coil from Dr. Pratts labor-atory. Dr. H. P. Pratt then gave a very fullexplanation of the physiologic and thera-peutic action of high frequency currents,showi

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