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 94
free poles are developed at the ends of the cores , which , acting in conjunction with the others , produce rotation of the armature . The construction in detail by which this invention is illustrated is shown in the accompanying drawings . Fig . 60 is a view in side elevation of a motor embodying… … Fig . 61 Fig . 60 . insulation between the sheets . When complete , the frame makes a tield - magnet with inwardly projecting pole - pieces b and c . To adapt them to the requirements of this particular case these pole - pieces are out of line with one another , those marked b surround ing one end…
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