File:Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14777979203).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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Fig. 58.—Mortons static-induced current high-frequency apparatus.^ with each other. With the patient included in circuit in the mannershown in the diagram we do not know the value of the inductance andresistance offered by him. The arrangement of two condensers of smallcapacity is conducive to the production of oscillatory currents of rela-tively high frequency, and such currents will be produced if the patientoffers a sufficiently low resistance and inductance.^ * Journal of Advanced Therapeutics, January, 1903. *For a detailed account see articles by Dr. W. J. Morton in The Medical Eecord,pp. 365-371, 395-398,438-440, April 2,9, and 16,1881; and pp. 97-104, January 24,1891. HIGH-FREQUENCY CURRENTS. 121 DAusoisrvAL High-Feequenoy Apparatus. In tlie DArsonval apparatus* (Fig. 59) the terminals of the second-ary of an indnction coil are respectively connected with one terminal ofeach of two condensers. A spark-gap is placed across the secondary INDUCTION COIL
Text Appearing After Image:
Fig. 59.—DArsonval high-frequency apparatus. circuit. The other two terminals of the condensers are connected withthe ends of a short coil of a few turns of thick copper wire. One elec-trode is connected with one end of the short coil and the other electrodeis adapted by a sliding contact to include in circuit with the patient anydesired length of the short coil, and thus regulate the effect producedupon him. A straight rod, or tube, of copper may be substituted for the ^In Comptes-rendus, vol. cxvi., 1893, pp. 630-633, DArsonval (quoted in theSecond Eeport of the Committee on Current Classification and Nomenclature, andread before the American Electro-Therapeutic Association, September 24, 1903) statedin substance (a) that he had communicated to the Societe de Biologie, February 24 and25, 1891, the astonishing fact that when the frequency of a current was very greatexcitation of the nerves and muscles was not produced ; (b) that the sparking distance—^and therefore potential diff

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