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 486
or order of the poles in one field of force is opposite to that in the other , so that rotation of the discs in the same di rection develops a current in one from centre to circumference and in the other from circumference to centre . Contacts applied therefore to the shafts upon which the discs… … Fig . 390 . Fig . 391 . fields be the same , the same result as above will be obtained by driving the discs in opposite directions and crossing the connect ing belts . In this way the difficulty of securing and maintaining good contact with the peripheries of the discs is avoided and a cheap and…
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