. American X-ray journal . 1213 Correspondence 1213 The Action of the X-Ray and its Uses in Therapeutics. William B. Snow 1214 X-Light in the Treatment of Cancer. (Concluded). Clarence E. 1219 Address Communications to Dr. H. Preston INDEX TO THIS NUMBER. Page Frontispiece, Dr Goodspeed 1236 Equi-Potential Surfaces in X-Ray Field, Jno. T. Pitkir 1237 How to Treat Cancer. H. Valentine Knaggs 1239 Program of Roentgen Ray Society Meeting 1242 Practical X-Ray Diagnosis. J. Rudis- Jicinsky 1243 Report of Cases of Cancers Treated by X-Rays. J. D. Gibson 1247 Chicago Electro-Medical Society
. American X-ray journal . 1213 Correspondence 1213 The Action of the X-Ray and its Uses in Therapeutics. William B. Snow 1214 X-Light in the Treatment of Cancer. (Concluded). Clarence E. 1219 Address Communications to Dr. H. Preston INDEX TO THIS NUMBER. Page Frontispiece, Dr Goodspeed 1236 Equi-Potential Surfaces in X-Ray Field, Jno. T. Pitkir 1237 How to Treat Cancer. H. Valentine Knaggs 1239 Program of Roentgen Ray Society Meeting 1242 Practical X-Ray Diagnosis. J. Rudis- Jicinsky 1243 Report of Cases of Cancers Treated by X-Rays. J. D. Gibson 1247 Chicago Electro-Medical Society— Sixteenth Regular Meeting 1252 Notes on Electro-Therapeutics,Elmore : 1253 An X-Ray Expert for Chicago 1254 American Roentgen Ray Society— Third Annual 1256 Editorial Notes: Worlds Fair Congresses 1264 Roentgen Ray Meeting 1265 Correspondence 1265 Treatment for Tuberculosis,Sinusoidal Current,Muscular Twitchings,Flickering Tube,Electricity in Goitre.:, Managing Editor, Masonic Temple, THE AMERICAN X-RAY JOURNAL. Devoted to Practical X=Ray Work and Allied Arts and Sciences. Vol. XI. ST. LOUIS AND CHICAGO, DECEMBER, 1902. No. 6. Equi-Potential Surfaces in the X=RayField—Their Productionand Utilization.* BY JOHX T. PITKIX, M. D. Soon after the discovery of the x-rayby Professor Roentgen in 1895, the speak-er caused to be installed in his office aHoltz static machine having eight revolv-ing plates. During the seven years thathave intervened the number of revolvingplates has been gradually increased, tilltoday it is forty-six. Focusing or Jackson-Crookes tubes,which were then about the size of a largethumb, are now the size of a small arclight globe. Spark gaps, at first but oneor two, can now be increased to forty orfifty in number. Improvements in all thedetails of construction of the x-ray appa-ratus have been commensurate. It is thusfrom a practical experience with gener-ators of varying size and construction thatI am able to draw the fol
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