. The medical and surgical uses of electricity. . battery withoutshock. A rheostat of some form, though not always indispensable in electricapplications, is yet a great convenience, especially in central galvaniza-tion, in local galvanization of the nerve-centres, and in all internal andelectrolytic methods of treatment where strong currents are used it is anecessity. The advantage of this and various other forms of dry-current control- APPARATUS FOR ELECTRO-THERAPEUTICS. 287 lers (Fig. 75) that have been suggested lies in the possibility of utilizingthe whole strength of ones battery. The mec
. The medical and surgical uses of electricity. . battery withoutshock. A rheostat of some form, though not always indispensable in electricapplications, is yet a great convenience, especially in central galvaniza-tion, in local galvanization of the nerve-centres, and in all internal andelectrolytic methods of treatment where strong currents are used it is anecessity. The advantage of this and various other forms of dry-current control- APPARATUS FOR ELECTRO-THERAPEUTICS. 287 lers (Fig. 75) that have been suggested lies in the possibility of utilizingthe whole strength of ones battery. The mechanical principle of thisparticular rheostat is that of the letter-press, and one of its advantages liesin the possibility of utilizing the whole strength of ones battery. Aquantity of carbon in a finely divided state is placed in a small rubbercylinder which is between two metal plates, forming opposite ends of acircuit. By turning the knob on or off as marked, thereby com-pressing or relaxing the granular carbon contained in the rubber pouch,. Fig. 72.—The Kennelly Sinusoidal Machine (Edison Mfg. Co.). the current can be increased or decreased at pleasure. The absence ofliquids and the non-corrosibility of the material that offers the resistanceis a decided advantage. The Monell rheostat (Fig. 76), the first to be successfully applied todose regulation and registration of secondary coil currents, consists of twoparallel tubes fixed upon a base and containing a resisting fluid of definiteand permanent composition, through which a movable rod is raised or 288 ELECTRO-THERAPEUTICS. lowered by the operator. Tube No. i is given a high resistance to con-trol high-tension currents of great power. Tube No. 2 has a much lowerresistance for currents of less penetrative energy. The rheostat may beoperated in the secondary circuit of any high-grade induction apparatusto which suitable connections are attached. No claim is made that the rheostat is a faradic meter, but it is cali-brated
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
