A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . buttons s„ s2, and sa connecting, respectively, with 300,800, and 1,500 yards of No. 34 wire. If it is found that onecell is insufficient, the sliding contact t should be moved to theleft, to include the whole of the resistance-coil T before thelever H is moved to any of the other buttons for the purpose ofincluding more cells in the primary circuit. In the faradic circuit the pole-changer F also serves thepurpose of changing the polarity of the two binding-posts Eand Er The rheostats Rt and
A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . buttons s„ s2, and sa connecting, respectively, with 300,800, and 1,500 yards of No. 34 wire. If it is found that onecell is insufficient, the sliding contact t should be moved to theleft, to include the whole of the resistance-coil T before thelever H is moved to any of the other buttons for the purpose ofincluding more cells in the primary circuit. In the faradic circuit the pole-changer F also serves thepurpose of changing the polarity of the two binding-posts Eand Er The rheostats Rt and R2 are connected in shuntwith their respective circuits, as this insures a more evenregulation along the whole length of the rheostat instead of asmall portion of same, as is mostly the case when a rheostat isin series with the main circuit. 12 ELECTRICITY IN § 19 17. Fig. 4 illustrates a wall-board devised by Dr. WilliamJ. Herdman, of the University of Michigan. This is a veryexcellent arrangement of apparatus for accomplishing allelectrolytic work in genito-urinary surgery. For a description. Fig. 4Herdman Universal Bwitchboard of this wall-hoard, we refer the student to Plate XV, Art. 469,Electricity in Diseases of the Nervous System. HYDROGALVANISM 18. The instrument illustrated in Fig. 5 is designed forapplying the direct current to the various parts of the genito-urinary tract without bringing the instrument in actual contactwith the parts to be benefited thereby. The principle is that ofan electric bath; the electrified water gravitates into the cavities, §19 GENITO-URINARY DISEASES 13 which are thereby expanded, so that the whole surface of thecavities is more completely electrified than it could otherwise beand without the possibility of irritation that might arise fromthe use of the metal electrode, the instrument being only avehicle for conveying the electrified fluid. THEORY OF HYDROGALVANISM 19. By this means the urethra and bladder are submittedto the action
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