File:A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14781315354).jpg

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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cauteryand light battery, the plates of each cell being severallyconnected to alternately opposite brass pieces ; when lightis required, the hinged rod is used and the cells are con-nected in series ; in the case of the cautery, the sliding-rodcan be pushed in any desired distance until the platinumbe hot enough. This obviates the necessity of a rheostat.The zincs that are used in bichromate of potash, Bunsenand Daniell cells, require frequent amalgamation ; this isdone by first cleaning the zinc, then by dipping it into asolution of sulphuric acid (i to 10), and then by runningmercury over it and rubbing it in with a piece of flannel ora tooth-brush until the whole surface is quite bright. Thezinc should not hiss when replaced in the acid. If thesalt creeps over the sides of the Leclanche cells, the wholecell should be taken apart, the glass vessel washed, the Accessories 107 margins paraffined or vaselined, and the solution ofammonium chloride diluted. The zincs in these cells only
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ou o < O — 11, w =iP < require occasional reamalgamation. All brass connectionson the element board, etc., should be kept scrupulously k io8 A Manual of Practical Medical Electriciiy clean, and the ends of wires should be kept bright withemery-paper. If the battery seem after a time to fail, andno faults can be found in the electrodes, rheophores, orconnections, careful search must be made for the offendingcell. If the battery be provided with a double dial collectorthis will be easy. With a galvanometer and a moderateresistance in circuit, bring each cell successively and indi-vidually into circuit, and pick out the one that fails incausing a sufficient galvanometric deflection ; examine andmake good any faulty connection with it, and if none canbe found, unscrew the connections, and take the cell outand clean it, reamalgamating and replacing the zinc, andrefilling the cell with fresh ammonium chloride solution. If the collector be a single-handed one, collecting cell bycell,

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