. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . rior. The effect is practically the same, but when the wirewithin is carried to the end of the tube, the discharge is some-what more uniform to the tube over the whole surface. This,however, is not of practical advantage in most cases. An adjustable insulated handle, Fig. 20, of solid glass or vul-canite is a convenience permitting the operator to handle theelectrode during an administration without lessening the dis-charge from the current, which would otherwise pass offthrough his person. When a
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . rior. The effect is practically the same, but when the wirewithin is carried to the end of the tube, the discharge is some-what more uniform to the tube over the whole surface. This,however, is not of practical advantage in most cases. An adjustable insulated handle, Fig. 20, of solid glass or vul-canite is a convenience permitting the operator to handle theelectrode during an administration without lessening the dis-charge from the current, which would otherwise pass offthrough his person. When a static machine is employed to produce the dis-charges the positive pole is grounded, the electrode connectedwith the holder is either placed in some cavity of the patient,or held by the operator and connected with the negative spark-gap is then closed to about one-half inch and themachine started, after which the spark-gap is regulated to thecondition of the patient. If a coil is used for exciting the tube, a connection may bemade from the negative terminals of the coil, connections. THE CONVECTIVE MODES OF ADMINISTRATION. 41 being made with the patient as before. The current con-troller should be provided with many contact points withresistance changes slight or the step-up may be unpleasant tothe patient. The current, when using a coil, may also beregulated by making use of a Geissler tube three or four feetlong, one end of which is attached to a side of the coil, andprovided with a ring to which the operating electrode maybe attached. The ring can be moved to and fro from theterminal to regulate the discharges, which will then be of sec-ondary induction. In that case, the large tube should be at-tached to the positive side of the coil. The high-frequency discharges from the two sorts of ap-paratus differ somewhat in the chemical, heat, and vibratoryeffects. The chemical effects are most marked with the coilcurrent of greater amperage; and the vibratory effect is far
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