. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . ctify the alternating current, so that it maybe successfully used with the wall plate. Fig. 93 represents therectifier with the potential equalizer. It is furnished with com-plete directions for installing. The author has had no experiencewith this machine. The sinusoidal current has not come into general favor becauseof the kind of apparatus with which we have had to work. Theaverage machine is provided with a rheostat, by which t
. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . ctify the alternating current, so that it maybe successfully used with the wall plate. Fig. 93 represents therectifier with the potential equalizer. It is furnished with com-plete directions for installing. The author has had no experiencewith this machine. The sinusoidal current has not come into general favor becauseof the kind of apparatus with which we have had to work. Theaverage machine is provided with a rheostat, by which the strength DISEASES OF THE NERVOUS SYSTEM 173 of the current is controlled, but there is no provision for regulatingthe rate of the interruptions, a very important matter. Rapid interruptions and high-frequency currents have gone toofar in the high-frequency direction, and not enough attention isbeing paid to quality and quantity. Ordinarily the sinusoidal cur-rent has an interruption of 7,200 per minute, with an equal rise inpotential at each alternation. A current of this class, like the in-duced current, causes more or less tetanic muscular contractions,. Fig. 93.—Chemical rectifier, with the potential equalizer. without any intervening periods of muscular relaxation. In de-generated muscles very slow interruptions are necessary to pro-duce anything like normal physiological contractions, and for thispurpose the alternations should be as few as 10 per minute. Asinusoidal apparatus, producing a current that may be slowly in-terrupted, with a gradual rise and fall in potential, producing aslow sine wave, that may be made undulating, fluctuating, or surg-ing, will leave but little to be desired. A manufacturing firm has lately placed upon the market a plateknown as the Mcintosh polysine generator. It is claimed that thisnew apparatus is capable of furnishing the following modalities: 174 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY rapid sinusoidal, at 60 cycles; slow si
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
