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) (14570423349).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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the outer coatings of thejars are connected to the solenoid. The static machine may beused for low-frequency modalities as well as high. For high-frequency modalities the coil will be found far superior to thestatic machine. Fig. 30 is a diagrammatic illustration of an induction coil, Ley-den jars, and high-frequency solenoid. I represents the coil; a and 62 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY b are the battery or feed wires from the mains going to the primaryof the coil; c and d are the supports for the prime conductors eand f, and are also connected to the terminals of the secondarycoil I and the wires g and h, going to the inside coatings of theLeyden jars A and B; C is the spark gap between the prime con-ductors e and /. The solenoid H is a coil of thick wire, the ter-minals of which are connected to the outside coatings of the Ley-den jars at i and j. The reader is here referred to what has beensaid about the action of the Leyden jars under Static Induction(page 58).
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Pig. 30.—Arrangement for induction coil and high-frequency resonator. Fig. 30 illustrates the DArsonval-Hertz apparatus. Thesolenoid H is made up of a number of turns of heavy copper wire,the number of which depends upon the capacity of the Leydenjars. When a spark bridges across the air gap between the primeconductors at C, an electric resonance takes place between the jarsA and B and coil H. This resonance is the result of several thou-sand oscillations per second through the coil from jar to jar,producing what is known as a high-frequency current. If two persons M and M are connected by wire to the terminalsof coil H at n and n, and then connected by means of a wire support- ELECTROSTATICS 63 ing a light bulb S, the filament will glow to full incandescence,while the persons so connected will feel no sensation whatever.High-frequency currents carrying 15 amperes have been passedthrough the human body without doing the least harm. The fre-quency of these currents is from 500,000 to

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