File:The electro-therapeutic guide, or, A thousand questions asked and answered (1907) (14592921640).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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to flow from one substance to the other,when a suitable conductor intervenes, which is called a current of lelectrifi-cation. What is meant by magnetization? Magnetization is a force somewhat akin to the force of electrification,but differs principally from it in that its force is not prevented from exertingitself by the interposition of a di-electric, which is any elastic, transparentsubstance, of which air is an example. It manifests polarity. Uodestonepossesses this force naturally. Magnetization may be intensified by electri-fication. 44 THE ELECTRO-THERAPEUTIC GUIDE What is meant by ^diekctric?^ A dielectric is an elastic, transparent insulator, and this term is usuallyapplied to the atmospheric air. What is meant by ^field^ and lines of force?^ Any conductor, when energized by a current of electrification is sur-rounded by an area or zone of electric influence, the strength of which isdirectly proportional to the initial electric potential, and to the distance fromthe conductor.
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The accompanying sketch represents this zone, or series of zones, ofinfluence surrounding a live wire. The right hand cut shows the heav)^concentrated zone close to the live wire in longitudinal section, while thesmall left hand sketch shows the same in tubular or ring zone arrangementaround a live wire in a cross section. This area of more or less active in-fluence surrounding the live wire is called the field, aud the differentzones, as represented by the parallel and circular lines, are called lines offorce. What is meant by electric induction? Electric induction is the process by virtue of which a current of elec-trification is created in a wire, by the passage of a current of electrificationthrough another wire lying parallel to it. It is b)^ this same process thatmagnetization creates a current, when the wire is brought within the mag-netic field. What is an induced current, and in which direction does it flow? The induced current is the secondary currentset up in the parallel c

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