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 433
opposite sign over the other . The disadvan tages of this arrangement , which would seem to result from the employment of sliding contacts , are in reality very slight , inas much as the electromotive force of the secondaries may be made exceedingly low , so that sparking at the brushes is avoided… … Fig . 223 . and revolving armatures of two induction devices . The arma tures o p are preferably mounted on tlip same shaft , and are ad justed relatively to one another in such manner that when the self - induction in one branch , as c , is maximum , in the other branch d it is minimum . The…
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