. Hand-book of electro-therapeutics . ^ that each oneuses the disruptive discharge of a condenser to produce vibra-tion, or the ^^to-and-fro movement of the Fig. 66.—Campbell X-ray tube. Much has been written lately upon the subject of highfrequency currents. In fact, so many contradictory statementshave been made that it is at times difficult to know what tobelieve. Although dArsonval was enabled to pass, through thehuman body, currents of high frequency which at a lower fre-quency would have been fatal, his apparatus has the seriousdrawback that it will produce only a current of lo
. Hand-book of electro-therapeutics . ^ that each oneuses the disruptive discharge of a condenser to produce vibra-tion, or the ^^to-and-fro movement of the Fig. 66.—Campbell X-ray tube. Much has been written lately upon the subject of highfrequency currents. In fact, so many contradictory statementshave been made that it is at times difficult to know what tobelieve. Although dArsonval was enabled to pass, through thehuman body, currents of high frequency which at a lower fre-quency would have been fatal, his apparatus has the seriousdrawback that it will produce only a current of low used a solenoid. Oudin, to overcome the disadvantages ofthe dArsonval method, added a resonator. This raised thevoltage very much. In Europe, the Oudin apparatus gaveexcellent results because of the care with which it was this country we obtain our high frequency currents princi- HIGH FREQUENCY CURRENTS. 125 pally from the static machine and from an apparatus based onthe induction principle as employed by Tesla, In this apparatusthere is used a disruptive discharge coil, or high frequencytransformer. By means of the Tesla apparatus the s
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