. Dental electro-therapeutics. de ofthe box and they discharge through the inductance. Theopen part of this which resonates to the closed part isbrought to a terminal on the other side of the box, and tothis the vacuum electrodes are attached. The strength of the discharge is regulated by the lengthof the spark-gap and also, to a certain extent, by the ad-justment of the interrupter on the coil. It can be variedfrom a very slight pricking sensation obtained from thevacuum electrode, to a light violet glow in the same whichproduces a strong sparking effect between the glass andthe skin of the p
. Dental electro-therapeutics. de ofthe box and they discharge through the inductance. Theopen part of this which resonates to the closed part isbrought to a terminal on the other side of the box, and tothis the vacuum electrodes are attached. The strength of the discharge is regulated by the lengthof the spark-gap and also, to a certain extent, by the ad-justment of the interrupter on the coil. It can be variedfrom a very slight pricking sensation obtained from thevacuum electrode, to a light violet glow in the same whichproduces a strong sparking effect between the glass andthe skin of the patient. The apparatus is connected direct to the main and noauxiliary resistance or other apparatus is necessary. HIGH FREQUENCY CURRENTS 139 The current from this apparatus produces a violet brushdischarge when the glass electrode is brought in closeproximity to the tissues, the discharge is produced at theouter surface of the glass by induction, and correspondsin polarity to the current flowing in the wire within the Fig. 68. Invictus portable high frequency apparatus. glass electrode. There is a certain amount of heat pro-duced which in these small currents is not discernible ifgood conduction is established. The interiors of the tubesare liable to be heated slightly by the incandescence of theluminous discharges of the current. CHAPTER VI. DENTAL ELECTRICAL APPARATUSES ANDAPPLIANCES. Motors—Electric Engines—Electric Lathes—Switchboards—Accumu-lators—Direct Resistance—Motor Converter—Electric Hot-air Syringe—Electric Sterilizer and Hot Water Apparatus—Footwarmer—ElectricFurnaces—Pyrometer—Electric Gold Annealer. Motors.—Motors for operating room engines, laboratorypolishing and grinding lathes, ventilating fans and com-pressed air pumps, are usually constructed of a pair offixed electro-magnets for generating a magnetic field, anarmature which revolves in the magnetic field, and a con-trolling resistance for regulating the speed. The electric field
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