The inventions, researches and writings of Nikola Tesla : with special reference to his work in polyphase currents and high potential lighting (1894)
Martin, Thomas C, Tesla, Nikola · The Electrical Engineer · leaf 31
11 POLYPHASE CURRENTS . shifting of the poles of one of its elements , and the question presented itself — How to perform this operation by the direct action of alternate currents ' t I will now proceed to show how this result was accomplished . In the first experiment a drum - armature was… … Fig . la . Fig . U two coils at right angles to each other , and the ends of these coils were connected to two pairs of insulated contact - rings as usual . A . ring was then made of thin insulated plates of sheet - iron and wound with four coils , each two opposite coils being connected together…
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