An international system of electro-therapeutics : for students, general practitioners, and specialists . ithin a few minutes, withoutchange of any kind b^^ tlie operator, the electrodes even remaining inprecisely the same place. More striking still are the greater physiologi-cal effects of currents of small quantity and low tension over currents ofgreat quantity and high tension : the latter from a fine coil of 6500 winds,with a primary force of 300 milliamperes, 5 volts, 5000 interruptions, and13 micro-coulombs of opening impulse, produced only a distinct jerk with FARADIC CURRENT, MAGNETISM,
An international system of electro-therapeutics : for students, general practitioners, and specialists . ithin a few minutes, withoutchange of any kind b^^ tlie operator, the electrodes even remaining inprecisely the same place. More striking still are the greater physiologi-cal effects of currents of small quantity and low tension over currents ofgreat quantity and high tension : the latter from a fine coil of 6500 winds,with a primary force of 300 milliamperes, 5 volts, 5000 interruptions, and13 micro-coulombs of opening impulse, produced only a distinct jerk with FARADIC CURRENT, MAGNETISM, MASSAGE, ETC. A-147 no disagreeable sensations, whilst the heavy coil, with 528 windings andless than 4 micro-coulombs, produced strong and painful is with low resistance, under the less-frequent conditions of applica-tion : the opposite effect would be observed were the test made with thehigh resistaiice generally found in faradic treatment. This striking result is due (Dubois, Stauffer) to the influence of theextra- or self- induced current of opening, within the secondary coil,. Fig. 6.—Edelmann Faradimeter. upon its own coil-current. The self-induced current is, in oppositedirection to the current proper in its own circuit, more effective than thecurrent circulating in a neighboring circuit, and, being in opposite direc-tion, it prolongs the variable stage of the original current which estab-lishes it, prolonging its duration at the expense of its tension, withoutaltering quantity or galvanometric measure; as these self-inductioneffects increase with the number of windings and the thinness ofthe wire, the co-efficient 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
