This is Egg of Columbus, a device exhibited in the Westinghouse...

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This is Egg of Columbus, a device exhibited in the Westinghouse display at the 1893 Chicago World's Columbian Exposition to explain the rotating magnetic field that drove the new alternating current induction motors designed by inventor Ni... | Minds

...ghouse display at the 1893 Chicago World's Columbian Exposition to explain the rotating magnetic field that drove the new alternating current induction motors designed by inventor Nikola Tesla.....

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