Tesla Notes 01: The Gramme Dynamo and the Professor's Verdict
Graz, 1877: a Gramme machine sparks at its brushes, my professor calls a motor without them perpetual motion, and I set out to prove him wrong.
Tesla's Graz notebook: the emf of a turning coil, why a commutator gives 2/π of the peak, why brushes spark, and Poeschl's verdict.
Nikola Tesla
November 5, 2026
30 min