. American X-ray journal . found nega-tive potentials of to volts. Theauthor calls attention to the *fact that inelectro-meter measurements of such poten-tials, which are of the order of the Voltacontact potentials, it is necessary to con-sider all electro-motive forces which ap-pear between the single metallic parts ofthe electrometer or the whole electrometersystem, when they touch each other. Insuch cases the metals to be investigatedand the metals of which the electrometeris composed have to be of the same , however, the electrometer quadrantswere of brass there was al
. American X-ray journal . found nega-tive potentials of to volts. Theauthor calls attention to the *fact that inelectro-meter measurements of such poten-tials, which are of the order of the Voltacontact potentials, it is necessary to con-sider all electro-motive forces which ap-pear between the single metallic parts ofthe electrometer or the whole electrometersystem, when they touch each other. Insuch cases the metals to be investigatedand the metals of which the electrometeris composed have to be of the same , however, the electrometer quadrantswere of brass there was always the voltaicelectromotive force of brass against lead,aluminum, etc., acting in the forces generate potentials, the valueof which is equal to or greater than thosemeasured by the first-named experiment-ers. If the above influence of the voltaicpotentials has not been excluded, there isno necessity to assume a general and spon-taneous electronic emanation of all metal-lic surfaces.—Phys. Zeit., October THE AMERICAN X-RAY JOURNAL PUBLISHED MONTHLY BY THE AMERICAN X-RAY PUBLISHING State St., Masonic Temple 1207, Chicago, T. PROCTOR HALL. A. Ph. I>.. H. I>.Managing Editor. H. PRESTOX PRATT. M. I>. SUBSCRIPTION RATES—IN ADVANCE: United States, Canada and Mexico $ I Foreign Countries $ Single Copies 50 | Single Copies 60 Contributions of Original articles and other matter relative to X-Radiance and Electrotherapy, ot interest tothe medicai profession, are solicited from all parts of the world. Contributors will be furnished extra copies of the •Journal containing their articles at cost of publication. Entered as Second-Class Matter, March 4, 1903, at the Postoffice at Chicago, 111., under the Act of Congress of March 3,1879. Vol. XIII. CHICAGO, NOVEMBER, 1903. No. 5 CONTENTS. PAGE. Frontispiece, Dr. Byron Robinson 315 Electro-Therapy, Lesson 6 316 American Electro-Medical Society 31S Chicago Electro-Medical Socie
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