Tesla Elecro-Magnet Motor Patent US381968 p 1-4 Poster
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A rotating magnetic field is a magnetic field which periodically changes direction. This is a key principle to the operation of alternating-current motor. In 1882, Nikola Tesla identified the concept of the rotating magnetic field. In 1888, Tesla gained U.S. Patent 381968 for his work. These are the drawings. Pages 1-4; Released under the GNU Free Documentation License.
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