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 239
here used is immersed in oil , and the ends of the secondary reaching out of the oil are covered with an air - tight cover of hard rubber of great thickness . All cracks , if there are any , should be carefully stopped up , so that the brush dis charge cannot form anywhere except on the small… … Fig . 140 . The potential may be raised by increasing , as far as the experi menter judges proper , the rate of change of the primary cur rent . With a coil not widely differing from the present , it is best to connect the two primaries in multiple arc ; but if the secondary should have a much…
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