The Inventions, Researches and Writings of Nikola Tesla

CHAPTER XXXVI.

THERMO-MAGNETIC MOTORS AND PYRO-MAGNETIC GENERATORS . . . . . . . . . 424
These devices were intended to convert heat directly into mechanical energy or electricity by exploiting the way magnetic materials lose their magnetism when heated (the Curie point).

CHAPTER XXXVII.

ANTI-SPARKING DYNAMO BRUSH AND COMMUTATOR . . . . . . . 432
A dynamo brush is a component that conducts current between stationary wires and moving parts. Sparking was a major technical hurdle in early DC motors and generators that caused wear and inefficiency.

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
Arc lamps were the first type of electric light used for street lighting; they produced light by creating a brilliant electric spark between two carbon rods.

CHAPTER XLI.

IMPROVEMENT IN UNIPOLAR GENERATORS . . . . . . . . . . . . 465
A unipolar generator (or Faraday disc) is a DC generator that produces electricity by rotating a conductive disc in a magnetic field, providing a constant flow of current in one direction without needing a commutator.

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PART IV.

APPENDIX: EARLY PHASE MOTORS AND THE TESLA OSCILLATORS.

CHAPTER XLII.

MR. TESLA’S PERSONAL EXHIBIT AT THE WORLD’S FAIR . . . 477
This refers to the 1893 World's Columbian Exposition in Chicago, where Tesla and Westinghouse triumphantly demonstrated the safety and efficacy of the alternating current (AC) system.

CHAPTER XLIII.

THE TESLA MECHANICAL AND ELECTRICAL OSCILLATORS . . . 486
Tesla's oscillators were steam-powered generators designed to produce high-frequency currents with extreme mechanical precision, which he hoped would replace the standard steam engines of the day.