. The medical and surgical uses of electricity : including the X-ray, Finsen light, vibratory therapeutics, and high-frequency currents . Laboratory, NewYork Medical Record, December 31st, 1892. Generale des Sciences pures et appliquees, Paris, May 15th, 1894, and RevueInternationale de IElectrotherapie, Paris, April, May, and June, 1893. 176 ELECTRO-PHYSIOLOGY. rents are distributed especially on the surface. How account, then, forthe induced currents exhibited in the organism, especially in the nervouscentres? DArsonval does this by a theory, attributing to different nervesdifferent
. The medical and surgical uses of electricity : including the X-ray, Finsen light, vibratory therapeutics, and high-frequency currents . Laboratory, NewYork Medical Record, December 31st, 1892. Generale des Sciences pures et appliquees, Paris, May 15th, 1894, and RevueInternationale de IElectrotherapie, Paris, April, May, and June, 1893. 176 ELECTRO-PHYSIOLOGY. rents are distributed especially on the surface. How account, then, forthe induced currents exhibited in the organism, especially in the nervouscentres? DArsonval does this by a theory, attributing to different nervesdifferent modes of excitation, by which they are found in unison withelectric waves only for vibratory periods comprised in fixed limits. Aboveand below these limits no electric irritation will take place. If this is so,there are limits for each class of nerve, and this is exactly the result ofhis experiment. He makes use of apparatus for obtaining currents ofgreat frequency and feeble intensity (Fig. 49). A continuous current of great intensity (A and B) puts in play aRuhmkorff coil; the two ends of the coil lead to the internal armatures. Fig. 49.—Method of Obtaining Currents of Great Frequency and Feeble Intensity. (DArson-val.) (D and C) of two Leyden jars; the external armatures (E and F) of thesejars are united by the solenoid (G) and by the cord (I), in the circuit ofwhich is interposed the incandescent lamp (K) and the body of the opera-tor. This apparatus may be used with entire safety. The theory of in-duced currents in the tissues is supported by the experiment illustrated inFig. 50. The operator holds between his arms the solenoid attached to thecurrent of high frequency. The current induced in his arms by the vicinity of the solenoid issufificient to render incandescent a 2-ampere lamp, completing the circuitformed by the arms. In the same manner the whole body may be en-closed in a large solenoid and subjected to the action of the current. Ithas been found that the vaso-
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