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 464
444 INVENTIONS OF NIKOLA TESLA . The arrangement shown in Fig . 262 is advantageous , as it dim inishes the sparking upon the commutator , the main circuit being closed through the auxiliary brushes at the moment of the break of the circuit at the main brushes . … Fig . 259 . O - O - O - - O — G — O — O - O Fig . 260 . ^ c . Fig . 261 . Qc mm y a Fig . 262 . Fig . 263 . The field helices may be wound in the same direction , or a part may be wound in opposite directions . The connection between the helices and the auxiliary brush or brushes may be made by a…
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