. Hand-book of electro-therapeutics . Fig. 72.—Campbell dArsonval attachment. GLASS VACUUM ELECTRODES. In using high frequency currents we employ glass vacuumelectrodes of different sizes and shapes, according to what partof the body is to be treated. If we connect one of these glasselectrodes to the apparatus and then bring the hand near theelectrode, we will notice a violet brush discharge which is pro-duced by induction at the outer side of the glass. When weplace this form of electrode in contact with the body, we atonce perceive the sensation of heat; as we move the electrodefarther from
. Hand-book of electro-therapeutics . Fig. 72.—Campbell dArsonval attachment. GLASS VACUUM ELECTRODES. In using high frequency currents we employ glass vacuumelectrodes of different sizes and shapes, according to what partof the body is to be treated. If we connect one of these glasselectrodes to the apparatus and then bring the hand near theelectrode, we will notice a violet brush discharge which is pro-duced by induction at the outer side of the glass. When weplace this form of electrode in contact with the body, we atonce perceive the sensation of heat; as we move the electrodefarther from the skin we notice that the sparks become largerand more intense and change to a white color. We should avoid 128 Fig. 73.—Campbell coil and cabinet.
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