An international system of electro-therapeutics : for students, general practitioners, and specialists . of self-induction is much higher for the finecoil, and the current is counteracted far more than in the coarse coil, A-148 ENGELMANN. being practically 0 in Coil I (Engelmann), ohm resistance; hence itsgreater maximum intensity with less quantity and greater physiologicaleffect on nerve and muscle. Even less indicative of physiological effect than the gradation of thescale in micro-coulombs is that of the Edelmann faradimeter (Fig. 6) involts, which is only for a given coil, with a give
An international system of electro-therapeutics : for students, general practitioners, and specialists . of self-induction is much higher for the finecoil, and the current is counteracted far more than in the coarse coil, A-148 ENGELMANN. being practically 0 in Coil I (Engelmann), ohm resistance; hence itsgreater maximum intensity with less quantity and greater physiologicaleffect on nerve and muscle. Even less indicative of physiological effect than the gradation of thescale in micro-coulombs is that of the Edelmann faradimeter (Fig. 6) involts, which is only for a given coil, with a given inducing flow on shortcircuit, but fails when body-resistance is interposed. The instrumentconsists of two parts: the stand with the Grenet cells, C, i?, and A,with rheostat, W and D, and galvanometer, G, attached to the wall,and the faradic apparatus some distance away, in order that the gal-vanometer may be removed from the magnetic influence of the iron corewithin the primary coil. The cell G supplies the motive power for thecurrent-interrupter independent of B and A, which give the current for. -CNLH-5 Fig. 7.—Course of Curkent in Edelmann Faradimeter and in My Instrument,WITH Separation of Coil and Interrupter. P, battery for coil; /, ooil; E, hammer-magnet; B, battery for hammer. the coils ; this primary current must be one of 300 milliamperes, inorder that the position of the secondary coil may always ihdicate thecorrect volt-force of the secondary induction current, as marked on thescale, B, of the sledge. .1 use but one Grenet cell, and even this gives a stronger currentthan necessary, but, by the nickelin-wire rheostat, W and i), throughwhich it passes, it may be reduced to the necessary intensity of 300milliamperes, which is verified by the galvanometer, (?, through whichthe current may be sent at will by pressure on the spring-head, S,now and then during the seance. The force of tlie primary flow iscontrolled by testing the galvanometric effect. Fig. 1 shows the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
