File:The electro-therapeutic guide, or, A thousand questions asked and answered (1907) (14779200552).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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ial Meter Dead Beat Meter What is a rheostat^ and its «se? A rheostat may be made in several ways, but the best consists of asickle shaped sheet of graphite upon a base of slate through which the cur-rent is made to pass by means of a revolving arm with a spring contact, thewires being attached to the graphite and arm by the way of binding posts,connected therewith. A rheostat is used to vary the amount of resistance in the circuit and todo it so gradually that any shock to the patient will be avoided. The graphite rheostat is constructed on the shunt principle, thus in-suring safety in its employment with either battery or dynamo currents, forthe most delicate operations. The current can be controlled from zero to thefull voltage of the circuit absolutely without break or shock to the patient,as indicated l)y the perfect eveness with which the needle of a sensitivemilliampere meter travels forward or backward as the current is increased ordiminished. THE ELECTRO-THERAPEUTIC GUIDE 27
Text Appearing After Image:
Graphite Rheostat Shunt Wiring In delicate operations a current as small as one-thirtieth of a milliam-pere is frequently sufficient; but if the operation is to be painles.;, the controlof the current must be absolutely perfect. Remember:—This is a shunt rheostat with carrying capacity of one-half ampere, therefore, in using this controller with either the constant orthe alternating dynamo current, it should be used in series with a 16 candlepower lamp. Caution:—Use care not to allow either grease, vaseline or oil to comein contact with the graphite surface, as the graphite is quickly removed byany free oil. What is a fheotome, and its use? There is a current breaking device, the rheotome, which worksautomatically, breaking in gradations either the galvanic or faradic. We show you here an automaticgraduated interrupter or rheotome,which can be connected with any bat-tery, to give slow or rapid breaks of thecurrent; and may be adjusted so as togive from 8 to 660 breaks per minute.I

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