CHAPTER XXVI

.

THE NEW YORK LECTURE. EXPERIMENTS WITH ALTERNATE CURRENTS OF VERY HIGH FREQUENCY, AND THEIR APPLICATION TO METHODS OF ARTIFICIAL ILLUMINATION, MAY 20, 1891. 145

## CHAPTER XXVII .

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

## 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 .

ALTERNATE CURRENT ELECTROSTATIC INDUCTION APPARATUS. 392

## CHAPTER XXXI .

"MASSAGE" WITH CURRENTS OF HIGH FREQUENCY. 394

## CHAPTER XXXII .

ELECTRIC DISCHARGE IN VACUUM TUBES. 396

## PART III.

MISCELLANEOUS INVENTIONS AND WRITINGS.

## CHAPTER XXXIII .

METHOD OF OBTAINING DIRECT FROM ALTERNATING CURRENTS. 409

## CHAPTER XXXIV .

CONDENSERS WITH PLATES IN OIL. 418

## CHAPTER XXXV .

ELECTROLYTIC REGISTERING METER. 420

## CHAPTER XXXVI .

THERMO-MAGNETIC MOTORS AND PYRO-MAGNETIC GENERATORS. 424

## CHAPTER XXXVII .

ANTI-SPARKING DYNAMO BRUSH AND COMMUTATOR. 432

## CHAPTER XXXVIII .

AUXILIARY BRUSH REGULATION OF DIRECT CURRENT DYNAMOS. 438

## CHAPTER XXXIX .

IMPROVEMENT IN DYNAMO AND MOTOR CONSTRUCTION. 448

## CHAPTER XL .

TESLA DIRECT CURRENT ARC LIGHTING SYSTEM. 451

## CHAPTER XLI .

IMPROVEMENT IN UNIPOLAR GENERATORS. 465

## PART IV.

APPENDIX: EARLY PHASE MOTORS AND THE TESLA OSCILLATORS.

## CHAPTER XLII .

MR. TESLA'S PERSONAL EXHIBIT AT THE WORLD'S FAIR. 477

## CHAPTER XLIII .

THE TESLA MECHANICAL AND ELECTRICAL OSCILLATORS. 486

## PART I.

POLYPHASE CURRENTS.

##