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 110
cribed . If an armature — for instance , a simple disc f , mounted to rotate freely on an axis — be brought into proximity to the core , a movement of rota tion will be imparted to the disc , the direction depending upon its position relatively to the core , the tendency being to turn the portion… … Fig . 74 . in that figure represent a circular frame of iron , from diametric ally opposite points of the interior of which the cores project . Each core is composed of three main parts b , b and c , and they are similarly formed with a straight portion or body e , around which the energizing coil…
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