. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . High frequency or Gudin resonator. as before), is connected to a point on the main oscillating circuit;the other end is left free. If now the capacity and inductance of theresonator are such that it is in tune with the main circuit, the discharge ELECTRICAL OSCILLATIONS 103 of the latter will excite oscillations of considerable amplitude in it, sothat the free end will undergo alternations of potential sometimes muchlarger than those in the exciting circuit. This will become manifest bya powerful b
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . High frequency or Gudin resonator. as before), is connected to a point on the main oscillating circuit;the other end is left free. If now the capacity and inductance of theresonator are such that it is in tune with the main circuit, the discharge ELECTRICAL OSCILLATIONS 103 of the latter will excite oscillations of considerable amplitude in it, sothat the free end will undergo alternations of potential sometimes muchlarger than those in the exciting circuit. This will become manifest bya powerful brush discharge which appears at this point. For the maximum effect the frequencies of the two systems mustcorrespond. Even when this correspondence is once attained, it will be. Self-exciting resonator. destroyed if the capacity of the resonator is altered by connecting itwith any apparatus, or, as in medical treatment, with a patient. Tomake a readjustment possible, the connection with either the resonatoror the solenoid is made adjustable so as to vary the length of the coilused. By thus altering the inductance, the frequency of one coil ma}^be adjusted to that of the other. A small alteration of this adjustmentwill make a striking change in the amount of the discharge. Fig. 80
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