File:Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14758083915).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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ses in the direction D, there is a decrease of current,because of a decrease in the area of the magnetic field, and vice versa. 4?, 44 ELECTEO-THEEAPEUTICS. The operation of the coil is as follows : The cell current proceedingfrom the carbon pole of the cell traverses the primary coil, and returnsto the cell through the interrupter, the platinum points of the latterbeing in contact. In the act of traversing the coil, this current makesthe core magnetic, which iu turn attracts the small armature on the in-terrupter, breaking the cell current; the magnetism of the core nowhaving disappeared, the spring returns to contact, when the process isagain repeated. On closure of the cell current a reverse inductionarises in the secondary coil, but this rises slowly on account of self-induction between contiguous windings of the primary coil. At theinstant of opening the cell current, a direct current arises in the sec-ondary coil of a much sharper curve of ascent because there is but little Int.
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Fig. 28.—Medical induction coU. self-induction to interfere with it. It is imperative that these coils shallnot touch each other at a single point. Upon opening or closing theprimary circuit, there will be established an induced current in thesecondary coil. This type of electric current is produced by the use of amedical Euhmkorff coil. The screw of the vibrating hammer shouldalways be most carefully regulated. Some of the coils have two kinds ofinterrupters accompanying the outfit. One of these is slow, while theother is more or less rapid. Occasionally the hammer requires a slighttouch of the finger in order to be started so as to form a circuitbetween the coil and cell or battery. The current produced by a fa-radic equipment is alternating in character, as may be readily demon-strated when applied to the tissues. Instead of a current from a cell,advantage is often taken of a direct 110-current, as is well illustrated inFig. 29. INDUCED CURRENTS. 45 Interrupter or Eheotome. The i

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