. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . apeutic a chair is shown in Fig. 4. It is provided with a highback, making it possible to hold an electrode against the is so constructed that the back may be lowered and an ex-tension provided for the feet in order that the patient, if sodesired, may lie at full length upon the chair. The seat istwenty inches wide, and arms are provided for the comfort ofpatients during long administrations. Stirrups of wood should also be provided, which will en-able the operator to place his pa
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . apeutic a chair is shown in Fig. 4. It is provided with a highback, making it possible to hold an electrode against the is so constructed that the back may be lowered and an ex-tension provided for the feet in order that the patient, if sodesired, may lie at full length upon the chair. The seat istwenty inches wide, and arms are provided for the comfort ofpatients during long administrations. Stirrups of wood should also be provided, which will en-able the operator to place his patient in various positions formaking the necessary administrations. While a chair of thisparticular design is not indispensable, we believe that it willgenerally be found convenient. The common electrodes and instruments for general pur-poses should be three ball electrodes for administering sparks, APPARATUS. 13 having diameters of two to two and three-quarter inches, oneand one-half inches, and one-half inch respectively. Thesmall ball, Fig, 5, is for the purpose of administering sparks in. Fig. 4. the angles and clefts of the body. The middle size, Fig. 6, isconvenient for administering sparks to the hands or face. Thelargest ball, Fig. 7, is for most common use in the administra-tion of sparks and friction sparks, and should be provided with Fig- 5. a metal portion extending from the brass ball to the vulcanitehandle, and will be found convenient if made for application offriction sparks to convex surfaces, curved to adapt to the parts 14 STATIC ELECTRICITY. at the junction with the ball, as shown in the accompanying roller, which is of no therapeutic value, as the friction Fig. 6. sparks are more conveniently administered from the brass ballabove described (see Fig. 8) ; a roller, however, is of great con-
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