. The application of electricity as a therapeutic agent. tobe closed. Faraday discovered that the primary current as just ex-plained, when passed through a coil of wire about whichwas wound another coil thoroughly insulated from thefirst, produced within the second coil a current of electricityof but a moments duration if the primary current floweduninterruptedly; but upon breaking or interrupting thecontinuity of the primary current it appeared again, but ofa polarity reversed from that at first exhibited, so that bythe rapid vibration of the rheotome we get upon thesecondary wire a rapid pul
. The application of electricity as a therapeutic agent. tobe closed. Faraday discovered that the primary current as just ex-plained, when passed through a coil of wire about whichwas wound another coil thoroughly insulated from thefirst, produced within the second coil a current of electricityof but a moments duration if the primary current floweduninterruptedly; but upon breaking or interrupting thecontinuity of the primary current it appeared again, but ofa polarity reversed from that at first exhibited, so that bythe rapid vibration of the rheotome we get upon thesecondary wire a rapid pulsating current of alternatepolarity, highly intensified by the introduction of the soft 12 APPLICATION OF ELECTRICITY iron core placed within the centre of the coil. This cur-rent we designate the induced current, and thoughhaving no absolute polarity, yet we give it one by cour-tesy, from the fact that when the current upon the pri-mary coil is interrupted the induced current produced isstronger than when tile primary current is closed. Fig. 2 Fig. gives a good idea of what is intended to be conveyed, theheavier arrows in one direction and the lighter ones inthe other, showing the difference in the intensity of thiscurrent. To produce the superinduced or attenuated cur-rent another coil is used similar in construction to thatfrom which the induced current is derived; only here in-stead of the battery current being used as a primary force,we employ the induced current upon the first coil of wire,and by its action, together with the magnetism of the ironcore, a current by induction is produced upon the second-ary wire, termed a superinduced current, similar to the in-duced but greatly refined. Fig. 3 represents this current. AS A THERAPEUTIC AGENT. 13 It will be noticed that the arrows are smaller, showing,the attenuation, and that the polarity is alternate as in theinduced. The superinduced current, while of sufficient Fig. 3.
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