CONTENTS. xi

CHAPTER XXXVI.

Thermo-Magnetic Motors and Pyro-Magnetic Gene-rators.'. 424

CHAPTER XXXVII.

Anti-Sparking Dynamo Brush and Commutator. 432

CHAPTER XXXVIII.

Auxiliary Brush Regulation of Direct Current Dy-namos. 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 TESLAOSCILLATORS.

CHAPTER XLII.

Mr. Tesla’s Personal Exhibit at the World’s Fair... 471

CHAPTER XLIII.

The Tesla Mechanical and Electrical Oscillators... 486