Tesla Notes 03: Arago's Disc and the First Induction Motor (1883)
Paris and Strasbourg, 1882 to 1884: a copper disc chases a field made of timing, and I learn why it must always fall a little behind.
Tesla's Strasbourg notebook: Arago's disc, eddy currents and Lenz's law, the torque-slip law T = 2xm/(x² + m²), and his first induction motor.
Nikola Tesla
November 5, 2026
24 min