PREFACE TO THE SECOND EDITION. CHAPTER III. INSULATIONS AND CEMENTS. CHAPTER VI. SPECTRUM ANALYSIS. CHAPTER VII. CURRENTS IN VACUO. CHAPTER VIII. ROTATING EFFECTS. CHAPTER X. BATTERIES FOR COILS. CHAPTER XI. STORAGE OR SECONDARY CELL. CHAPTER XII. TESLA AND HERTZ EFFECTS. CHAPTER XIII. THE "ROENTGEN" RAYS AND RADIOGRAPHY. CHAPTER XIV. WIRELESS TELEGRAPHY. INCLUDING RUHMKORFF, TESLA, AND MEDICAL COILS, BY SECOND EDITION, REVISED AND MUCH ENLARGED Colophon NEW YORK: LONDON: |