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 62
42 INVENTIONS OV NIKOLA TESLA . If transformers be employed , one set of the primary coils , as n n , wound on a ring or annular core is connected to one circuit , as m ' , and the other primary coils , x n ' , to the circuit m . The secondary coils k k ' may then be utilized for running groups of… … Fig . 33 . two poles , a a , of steel permanently magnetized , or of iron ex cited by a battery or other generator of continuous currents , and a cylindrical armature core mounted on a shaft , b , and wound with two longitudinal coils , o c ' . One end of each of these coils is connected to the…
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