File:The electro-therapeutic guide, or, A thousand questions asked and answered (1907) (14593159477).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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generator can be used to transform an alterna- 54 THE KLECTRO-THKRAPEUTIC GUIDE ting current to a direct, but this is expensive. An alternating current canbe used for lighting and power, and can be transmitted long distances morecheaply than the direct current. What is a rectifier, and its uses? A rectifier is an apparatus by means of which it is possible to so changeor transform an alternated commercial current, as to make of it a direct orunidirectional current, which may be used for electrolytic w^ork. It will nothowever remove entirely the pulsating character of the current, and thereforeis not to be advised for delicate operations about the face, such as the removalof hairs and small facial blemishes. For the ordinary run of electro-the-rapeutic work the rectifier can be used in connection with the alternated cur-rent. Neither a direct or a rectified alternated current is as mild or as goodin effect as the true galvanic current which is derived from the chemical cellof a battery.
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AI^TERNATED CURREiNT RECTIFIERThe accompanying cut shows the common form of rectifier, with four THE BIvECTRO-THERAPEUTlC GUIDE 55 aluminum cells arranged in a quadrangle, although they may be arrangedin a row, if more convenient, to place on top of a wall plate case. There are several kinds of rectifiers, as the magnetic, inductive, mechan-ical, and electrolytic, but the last named kind is the best, because it is themost reliable, simplest and cheapest, and most economical, and having nomoving parts, will not get out of order. They are called aluminum cells, because one element of the cell is madeof aluminum. The practical value of the rectifier depends on the peculiar propertypossessed by aluminum, in that it will offer a very high resistance to thepassage of the current, when it is so placed as to be the anode of the cell,but does not so act when placed so as to be the cathode in the cell.

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