Tesla's Egg of Columbus

Nikola Tesla, at the 1893 World's Columbian Exposition, demonstrated a device he constructed known as the "Egg of Columbus." It was used to demonstrate and explain the principles of the rotating magnetic field model and the induction motor. Tesla's Egg of Columbus performed the feat of Columbus with a copper egg in a rotating magnetic field. The egg spins on its major axis, standing on end due to gyroscopic action.

Tesla's device used a toroidal iron core stator on which four coils were wound. The device was powered by a two-phase alternating current source (such as a variable speed alternator) to create the rotating magnetic field. The device operated on 25 to 300 hertz frequency. The ideal operating frequency was described as being between 35 and 40 hertz. Reproductions of the device are displayed at the Nikola Tesla Museum in Belgrade, the Memorial Centre "Nikola Tesla" in Smiljan, the Technical Museum in Zagreb, the Croatian History Museum in Zagreb and in the Ann Arbor Hands-On Museum.

Famous quotes containing the words tesla, egg and/or columbus:

    Your fate is to be what you are. As mine is to be what I am—your master.
    Griffin Jay, Randall Faye, and Lew Landers. Armand Tesla (Bela Lugosi)

    The egg is back. The egg is back.
    Jean-Bertrand Aristide, Haitian president. New York Times, p. 10A (September 6, 1994)

    These were the sounds that issued from the wigwams of this country before Columbus was born; they have not yet died away; and, with remarkably few exceptions, the language of their forefathers is still copious enough for them. I felt that I stood, or rather lay, as near to the primitive man of America, that night, as any of its discoverers ever did.
    Henry David Thoreau (1817–1862)