CONTENTS.

CHAPTER XXVII.

THE LONDON LECTURE. EXPERIMENTS WITH ALTERNATING CURRENTS OF HIGH POTENTIAL AND HIGH FREQUENCY, FEBRUARY 3, 1892 . . . . . . . 198

In this famous lecture at the Institution of Electrical Engineers, Tesla demonstrated many of his most startling discoveries, including lamps that glowed without wires. "High potential" is a historical term for high voltage.

CHAPTER XXVIII.

THE PHILADELPHIA AND ST. LOUIS LECTURE. ON LIGHT AND OTHER HIGH-FREQUENCY PHENOMENA, FEBRUARY AND MARCH, 1893 . . . . . . . 294

CHAPTER XXIX.

TESLA ALTERNATING CURRENT GENERATORS FOR HIGH FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

CHAPTER XXX.

ALTERNATING CURRENT ELECTROSTATIC INDUCTION APPARATUS . . . 392

CHAPTER XXXI.

"MASSAGE" WITH CURRENTS OF HIGH FREQUENCY . . . . . . 394

This refers to early medical electrotherapy. Tesla observed that high-frequency currents could pass through the body without causing pain or injury, leading to the development of diathermy and other physical therapies.

CHAPTER XXXII.

ELECTRIC DISCHARGE IN VACUUM TUBES . . . . . . . . . . 396

PART III.

MISCELLANEOUS INVENTIONS AND WRITINGS.

CHAPTER XXXIII.

METHOD OF OBTAINING DIRECT CURRENT FROM ALTERNATING CURRENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409

This chapter describes early methods of rectification—the process of converting alternating current (AC) into direct current (DC).

CHAPTER XXXIV.

CONDENSERS WITH PLATES IN OIL . . . . . . . . . . . . . 418

original: "Condensers." Now universally known as capacitors, these devices store electrical energy. Tesla used oil as an insulator to prevent the electrical charge from leaking or sparking between the plates at high voltages.

CHAPTER XXXV.

ELECTROLYTIC REGISTERING METER . . . . . . . . . . . . 420

An early type of electricity meter that measured energy consumption by tracking chemical changes in a solution (electrolysis) caused by the passing current.