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 58
d , the machine is a well - known form of alternating - current generator . To adapt it to his sys tem , however , Mr . Tesla winds on armature c a second set of coils b b intermediate to the first , or , in other words , in such po sitions that while the coils of one set are in the relative… … Fig . 30 . Fra . 31 . series and to two connecting - rings , secured generally to the shaft at the opposite end of the armature . The motor shown in Fig . 29 has an annular field - magnet h , with four pole - pieces wound with coils i . The armature is con structed similarly to the generator , but…
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