------------------------------------------------------------------------ [Illustration: DR. WILLIAM KONRAD ROENTGEN. pp. 69 to 85. Born in Holland, 1845. From a photograph by Hanfstaengl, Frankfort-on-the-Main. ] ------------------------------------------------------------------------ ROENTGEN RAYS AND PHENOMENA OF THE ANODE AND CATHODE. _PRINCIPLES, APPLICATIONS AND THEORIES_ BY EDWARD P. THOMPSON, M.E., E.E. Mem. Amer. Inst. Elec. Eng. Mem. Amer. Soc. Mech. Eng. Author of “Inventing as a Science and an Art.” _CONCLUDING CHAPTER_ BY PROF. WILLIAM A. ANTHONY, Formerly of Cornell University. Past President Amer. Inst. Elec. Eng. Author, with Prof. Brackett of Princeton, of “Text-Book of Physics.” 60 Diagrams. 45 Half-Tones. NEW YORK: D. VAN NOSTRAND COMPANY, 23 MURRAY AND 27 WARREN STREET. ------------------------------------------------------------------------ Copyright, 1896, BY EDWARD P. THOMPSON, Temple Court Building, New York. ------------------------------------------------------------------------ PREFACE. ------- IN addition to the illustrated feature for exhibiting the nature and practical application of X-rays, and for simplifying the descriptions, the book involves the disclosure of the facts and principles relating to the phenomena occurring between and around charged electrodes, separated by different gaseous media at various pressures. The specific aim is the treatment of the radiant energy developed within and from a discharge tube, the only source of X-rays.