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 501
that shown in Fig . 299 , was exhibited at the same lecture , in May , 1888 . They were the first rotating field motors ■ which were independently tested , having for that purpose been placed in the hands of Prof . An thony in the winter of 1887 - 88 . From these tests it was shown that the… … Fig . 299 . some time ago handed over to the care of Prof . Ayrton in Eng land . This model was originally provided with twelve independ ent coils ; this number , as Mr . Tesla pointed out in his first lec ture , being divisible by two and three , was selected in order to make various connections…
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