A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14803520893)

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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te. The plug rheostat or resistance box(Figs. 53 and 54) contains a number of coils of Germansilver wire ; each coil is wound with such an amount ofinsulated wire as to present a definite resistance, the twoends of the wire being connected severally to small brasspieces, which are securely fastened to an ebonite lid.These plates can be respectively connected with oneanother by the insertion between them of well-fitting brassplugs. When all the plugs are put in, the current flowseasily from brass piece to brass piece, from one end of thebox to the other ; but if a plug be withdrawn, the current iscompelled to travel round the coil of wire between the twobrass pieces, and so to encounter the known resistance ofthe wire. The coils are usually arranged in a series of 7 98 A Manual of Practical Medical Elfxtricity increasing resistances ; thus, the first may have a resist-ance of one ohm, the.second of two, tlie third of three, andso on, so that it is possible by combining them to obtain a

Text Appearing After Image:

Fig. 53.—Diagram of Plug Rheostat. wide range of resistance. These are expensive, but veryaccurate, instruments. In another and much simpler form for use with cautery

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1902

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