. Dental electro-therapeutics. Combined high frequeucy apparatus. 136 ELECTRO-PHYSICS A milliampere meter of the hot wire type (Fig. 66) 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 hasshown by experiment that an incandescent lamp placedin series between the instrument and the patient, so thatthe current must flow through the lamp before reaching Fig. 66. Hot wire milliampere meter. the patient, will glow brightly, yet no unpleasant sen
. Dental electro-therapeutics. Combined high frequeucy apparatus. 136 ELECTRO-PHYSICS A milliampere meter of the hot wire type (Fig. 66) 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 hasshown by experiment that an incandescent lamp placedin series between the instrument and the patient, so thatthe current must flow through the lamp before reaching Fig. 66. Hot wire milliampere meter. the patient, will glow brightly, yet no unpleasant sensationis noticed if the electrodes are firmly grasped. It wouldbe impossible to pass a similar current without seriouseffect on the body. In general electrification of the body by high frequencycurrents different methods are adopted for passing thecurrent to the body; by direct conduction from the ends ofthe solenoid; by conduction from one end of the solenoidwith the other end connected to a conductor placed inproximity but not touching the patient; and by auto-con-duction, which consists in placing the patient in spiralwire enclosures large enough to completely enclose himwithout touching him, the current passing through thewire enclosure or solenoid is transmitted bv induction. HIGH FREQUENCY CURRENTS 137 In the use of high frequency currents for local applica-tion in dental treatment a modified apparatus is has been carried out in one form by what is knownas the Tesla Transformer, princ
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