A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14597027798)

Identifier: manualofpractica00turn (find matches)
Title: A manual of practical medical electricity : the Röntgen rays and Finsen light
Year: 1902 (1900s)
Authors: Turner, Dawson
Subjects: X-Rays Electrophysiology Electrosurgery Electric Stimulation Therapy Electrotherapeutics X-rays Electrophysiology Electrosurgery
Publisher: New York : William Wood & Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



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lecting cell bycell, the task will also not be difficult ; the cells must beslowly brought into circuit with a galvanometer and a highresistance—i,ooo ohms if possible—included ; then, as theaddition of each cell should in the case of Leclanchescause an additional deflection of 1*5 m.a., the failing cellcan be picked out. If, however, the collector collect threeto five cells at a time, the process will be more tedious anddifficult ; but the same general plan must be pursued, andthe group of cells that do not give the proper amount ofgalvanometric deflection must be first localized, and theneach individual cell of the group must be taken out, con-nected with a galvanometer, and tested. CHAPTER IX FARADIC ELECTRICITY In 1831 Faraday discovered that a current of electricitycould be momentarily induced in a closed circuit byadvancing to it or withdrawing from it a magnet (Fig. 64).He followed this up by finding that a wire carrying acurrent had the same effect as the magnet (Fig. 65).
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Fig. 64.—Inducing Action of a Magnet on a Closed Circuit. Further, he found that, if two circuits were placed near toeach other, the making or the breaking of the circuit inthe one would induce momentary currents in the other ;this is, of course, merely equivalent to the previous state-ment, for by the making and breaking of the current inthe primary circuit we cause, as it were, a current-carrying no A Manual of Practical Medical Electricity wire to approach to and recede from our secondary circuitwith exceeding velocity and from infinite distance.