File:The electro-therapeutic guide, or, A thousand questions asked and answered (1907) (14593011848).jpg

Identifier: electrotherapeut00benn (find matches)
Title: The electro-therapeutic guide, or, A thousand questions asked and answered
Year: 1907 (1900s)
Authors: Bennett, Homer Clark, 1865-1928
Subjects: Electrotherapeutics Electricity in medicine Ohm's law X-rays Electricity Electricity X-Rays Electromagnetic Phenomena Electric Stimulation Therapy
Publisher: Lima (Ohio) : Literary Dept. of the National College of Electro-Therapeutics
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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hrough the outer end of thesecondary coil. You can at once see how, by merely pushing the core andprimary further into the secondary coil, that more turns are saturated, morelines of force cut and more induction and secondary current is generated inthe outer coil. What is a combination battery? The cut (p. 51) shows a new design for a combination of galvanic and fa-radic batteries, both in the same case, for convenience and portability. It canbe used with a number of small dry cells or can be connected and used withthe I ID volt direct incandescent light current, only reqiiiring a connectingcord and plug, to screw into a lamp socket at your office or at the patientshome. It consists of an improved double scale (0-20, 0-400) shunt milliam-pere meter, graphite rheostat, pole-changer and other necessary switches.The coil has both the hammer vibrator, with heavy ball attachment for slowvibration at one end, and a ribbon rapid vibrator or singing rheotome, THE ElvECTRO-THERAPEUTIC GUIDE 51
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at the other. This gives a wide range of usefulness, both for office and out-side work. The case is lox ii>^ X15 inches, and is strong, light, handsomeand durable, with a carrying strap. What is a smwsoidal current? A sinusoidal current is an alternating current, whose alternations oc-cur gradually, practically without interruption. The potential in one direc-tion is gradually overcome, neutralized, and finally succeeded by an equalamount of potential in the opposite direction. These changes follow theline of a sine curve, when illustrated diagrammatically, hence the name. What is the nature and effect of the sinusoidal current? The sinusoidal apparatus consists of a permanent magnet, between thepoles of which an armature revolves, while a coil with a soft iron core isconnected with each pole upon the outside. This current produces physio-logical and therapeutic effects, which are not obtained by any other form 52 THE ELECTRO-THERAPEUTIC GUIDE of current. The applications are painl

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