. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . vation. They may, if desired, be covered with wet flannel, or one electrode () may be held in the hand, while the tin plate is placed where seances should last from five to ten minutes and neither sparks ormuscular contractions should be caused. 2. —In this method the patient is surrounded by asolenoid which is connected with the apparatus, but he is not in directcontact with it (Fig. 230). As the currents pass through the solenoid,a similar current is induced in
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . vation. They may, if desired, be covered with wet flannel, or one electrode () may be held in the hand, while the tin plate is placed where seances should last from five to ten minutes and neither sparks ormuscular contractions should be caused. 2. —In this method the patient is surrounded by asolenoid which is connected with the apparatus, but he is not in directcontact with it (Fig. 230). As the currents pass through the solenoid,a similar current is induced in the body of the patient. The cage mustbe large enough to cover the entire body, and may be arranged so thatthe patient can stand up or lie down. Powerful currents are made topass through the body by this method, so that if the patient holds CURRENTS OF HIGH FREQUENCY 203 in each hand the terminal wires of an incandescent lamp, it will belighted. 3. Autocondensation.—When so employed the patient constitutes onearmature of a condenser, while the other consists of a large sheet of Fig. 230. Cage solenoid for autoconduetion. (Allen.) metal in his vicinity. This is most conveniently arranged by means ofa couch (Fig. 231), on which the patient lies, being separated from themetal sheet by an insulating cushion filled with rubber waste, whilehe holds in his hands metal electrodes connected with one end of the 264 METHODS OF PRODUCING GENERAL ELECTRIFICATION solenoid; the metal plate is connected with the other (Fig. 231). Bythis means, 400 or 500 milliamperes can be passed through the body. Amore convenient form of chair is that devised by Piffard, and shown inFigs. 232 and 233. Fig.
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