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 493
the current is forced to follow the lines of subdivision , we see that it will tend either to energize or de - energize the field , and this will depend , other things being equal , upon the direction of the lines of sub division . If the subdivision be as indicated by the full lines in Fig . 295 ,… … Fig . 206 . Fig . 295 . dicated by the dotted lines , the current generated will tend to weaken the magnet . In the former case the machine will be capable of exciting itself when the disc is rotated in the direction of arrow i > ; in the latter case the direction of rotation must be reversed . Two…
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-255-160.webp)
