. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ic machine. 260 METHODS OF PRODUCING GENERAL ELECTRIFICATION to fourteen inches in length. This should be placed along the a local influence is desired, smaller electrodes of similar materialapplied to the part should be used. Fig. 226 shows the connectionswhen only one electrode is employed. Various schemes have been devised to cause strong but slow interrup-tions of this current. That recently published by Pfahler^ seems to beone of the best. It prevents tetanic contractions of the mus
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ic machine. 260 METHODS OF PRODUCING GENERAL ELECTRIFICATION to fourteen inches in length. This should be placed along the a local influence is desired, smaller electrodes of similar materialapplied to the part should be used. Fig. 226 shows the connectionswhen only one electrode is employed. Various schemes have been devised to cause strong but slow interrup-tions of this current. That recently published by Pfahler^ seems to beone of the best. It prevents tetanic contractions of the muscles, whichtire them and cause pain. It consists in attaching an ordinary steeltape to the binding rod screw head. This is carried by a silk cord overthe other posts at the outer edge of the case, and thereby easily adjustedat the opposite edge of the machine. The steel tape should be broughtto within about one inch of the neutralizing rod. The spring pullsit back when the cord is relaxed. A thin wire is carried down to thegrounded side and hooked over the rod. A ball electrode (Fig. 181) is. Pendulum interrupter for the static wave current. (Pfahler.) A, support; B, binding post; C,steel spring tape; G, ground; N, neutral comb; P, patient; S, silk cord; W, wire. suspended midway between the two poles of the static machine. Thisis done by placing a screw eye in the top of the handle and hangingit on a hook from a short cord, which will eliminate all friction, the cordbeing stationary and providing sufficient insulation. This can hangfrom an adjustable cord if desired, which will aid in regulating thelength of the spark. The ball should hang so that it will just swingpast the ball on the rod of the opposite pole without striking when theproper length of spark is being obtained. A very fine wire should then be carried from the grounded pole upthrough the screw eye in the handle of the ball electrode and down tothe metallic ring attachment. The connections with the patient are mad
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