. Dental electro-therapeutics. Fig. 54.—High-frequency transformer. to the secondary terminals of an induction coil worked bymotor interrupter and also to the spark gap which is enclosedin a box inside which the sparking takes place between themetallic knobs which are adjustable to suit the spark outer coatings of the condensers are connectedthrough the solenoid, from which the currents are conveyed 120 BATTERY ACCESSORIES to the patient. The resonator is made of a eoil of copperwire, which is wound around a frame and placed on the. Fig. 55.—Combined high-frequency apparatus. top o
. Dental electro-therapeutics. Fig. 54.—High-frequency transformer. to the secondary terminals of an induction coil worked bymotor interrupter and also to the spark gap which is enclosedin a box inside which the sparking takes place between themetallic knobs which are adjustable to suit the spark outer coatings of the condensers are connectedthrough the solenoid, from which the currents are conveyed 120 BATTERY ACCESSORIES to the patient. The resonator is made of a eoil of copperwire, which is wound around a frame and placed on the. Fig. 55.—Combined high-frequency apparatus. top of the table. These two are connected in differentways according to the make of the apparatus; some haveadjustable contacts. HIGH-FREQUENCY CURRENTS 121 A milliampere meter of the hot wire type (Fig. 56) isusually connected between the patients and the solenoid,or the resonator of the high-frequency apparatus. High-frequency currents conducted from the solenoidto the body are of great magnitude. dArsonval has shownby experiment that an incandescent lamp placed in seriesbetween the instrument and the patient, so that the currentmust flow through the lamp before reaching the patient,will glow brightly, yet no unpleasant sensation is noticedif the electrodes are firmly grasped. It would be impossibleto pass a similar current without serious effect on the body.
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