. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . e of assorted sizes, making upwards of 15,000windings, tapped at approved lengths. By adjusting the switcharms connected with the coil the operator can produce twenty-one combinations in the secondary circuit, and can also unitethe primary coil with any of the secondary coils. The sim-plicity of the arrangement is a decided advantage over a seriesof separate spools operated by the old-fashioned sledge orplunger methods. The primary circuit rheostat controls the E. M. F. from the T
. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . e of assorted sizes, making upwards of 15,000windings, tapped at approved lengths. By adjusting the switcharms connected with the coil the operator can produce twenty-one combinations in the secondary circuit, and can also unitethe primary coil with any of the secondary coils. The sim-plicity of the arrangement is a decided advantage over a seriesof separate spools operated by the old-fashioned sledge orplunger methods. The primary circuit rheostat controls the E. M. F. from the THE ESSENTIALS OF FARADIC ELECTRO-PHYSICS. I05 cells. The secondan- rheostat controls the current in circuitwith the patient, entirely independent of the cells in use. This apparatus was not only the first to employ a secondarycurrent controller independent of the priman,, but is still theonly battery provided with the authors rheostat. Regulation of Current Strength.—All methods of regulat-ing faradic dosage, except through a secondary- current rheo-stat, are incomplete and unscientific. Plungers and sledge. Fig. iS Rheostat. arrangements not only add a detail to technique which de-mands the attention of the operator but the therapeutic qual-ities of any secondary coil are not fully developed until itsentire length overlaps the primary. If a fixed number of cellsis used and the strength of the current reduced by advancingthe secondary coil, only part of its length it is shorn of itsbest qualities and is improperly employed. If an excessive E. SI. F. is cut down bv a rheostat in the Io6 THE ESSENTIALS OF EARADIC ELECTRO-PHYSICS. cell circuit the vibrator is deprived of part of its actuatingforce, and may become irregular or stop. The problem of satisfactory control was solved by the authorin the rheostat devised in the early part of 1894. This rheostat, which is the peculiar novelty introduced inmy high-tension induction apparatus, consists of two glasstubes marked one and two
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Keywords: ., bookauthormonellshsamuelhowardd, bookcentury1800, bookdecade1890
