Tesla Notes 02: The Rotating Magnetic Field (Budapest, 1882)
Budapest, 1882: two currents a quarter period apart, drawn with a stick in the sand, make a field that turns while nothing turns it.
Tesla's Budapest notebook: how two or three phase-shifted currents make a field that turns, the (3/2)B cos(θ − ωt) proof, and why one phase cannot.
Nikola Tesla
November 5, 2026
25 min