. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . V V Metal electrodes for treatment bj derivation. Vacuum electrodes for treatment by derivation. 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
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . V V Metal electrodes for treatment bj derivation. Vacuum electrodes for treatment by derivation. 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 cons
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