A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14596957920)

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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e without at anytime breaking the current.This is the cheapest and simplest form of collector, but it isalso the slowest. In Fig. 46 it is shown to be collectingcells in pairs, but one by one would be preferable. The sledge collector is used in Dr. Stoehrers battery(Fig. 91, p. 145). The sledge, to which both the rheophoresare attached, and which carries on it a current reverser,slides along above the cells, making contact by springs onits under surface with conductors to which the wires from Accessories 93 the cells are led. and the springs are long enough to reachfrom conductor to conductor, so as to avoid breaking thecurrent as the sledge is moved. Of the ordinary or dial collector there are two forms—the single-handled and the double-handled. On the dial (Fig. 47) are placed a number of studs in acircular form, and to the under surface of each stud isfastened a branch wire from, say, the negative pole of eachcell respectively. To the central pin, upon which the handle turns, the
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Fig. 46.—Battery with Plug Collector. wire to the negative electrode is attached ; the otherextremity of the handle rests upon, and can be made toslide over, the studs, which are placed in such juxtapositionthat the handle must come into contact with the next onebefore the previous one is left. By this arrangement it is obvious that cells can berapidly added on or taken off without breaking contact.The disadvantage of the single-handled form is that the firstset of cells must always be put in action when the batteryis used, while the cells at the other extremity get perhaps 94 A Manual of Practical Medical Elfxtricity