A laboratory manual of electrotherapeutics . ancy in the oscillatorynature of the discharge from them, but the obstacles tothis end have not yet been overcome. Other sources than the static machine have thereforebeen sought for and developed for generating high poten-tial, high frequency currents. Tesla, Elihu Thomson anddArsonval have each been active in this search, and eachin his independent line of investigation has made use oflarge induction coils as step-up transformers of the originalelectric energy, which in some instances is derived fromalternating dynamos of low frequency and in othe
A laboratory manual of electrotherapeutics . ancy in the oscillatorynature of the discharge from them, but the obstacles tothis end have not yet been overcome. Other sources than the static machine have thereforebeen sought for and developed for generating high poten-tial, high frequency currents. Tesla, Elihu Thomson anddArsonval have each been active in this search, and eachin his independent line of investigation has made use oflarge induction coils as step-up transformers of the originalelectric energy, which in some instances is derived fromalternating dynamos of low frequency and in others fromsome direct current source, as a dynamo, a primary or OF ELECTROTHERAPEUTICS. IO7 secondary battery. The low frequency of the alternatingdynamo must be changed to a high frequency, and theconstant or direct current must be broken up into sud-den impulses with interruptions in order to furnish the Jrotx Care — H ^>v»to>* G11I L Oerny-, c7ci><j Giif Sy\ cVvvclvriYv Co\\_ iit Trcms^orvvNeV,—. „, c1 I ctt-dn. Fig. 44. proper variations for inducing currents in the windings ofthe induction coil. These necessities give rise to somepeculiarities in mechanism which have been variously con-structed by the different inventors. The underlying prin-ciples by which the ultimate result is secured are the same 108 LABORATORY MANUAL in all. The accompanying diagram (Fig. 44) will illus-trate the various steps in the process. B C D is an induction coil or transformer whose pri-mary coil is energized from some source, preferably analternating current dynamo. If the energizing current isa direct current source then the primary circuit wouldneed to be supplied with an interrupting device to breakthe current into periods, such as the spring vibratorattached to the ordinary induction coils or, what is better,a rotating disk driven by a motor and so arranged as tomake and break the circuit with great rapidity and sudden-ness, as in the method devised by dArsonval.
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