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 205
c , the tube could not . be lighted when the observer ’ s body is interposed between it and the coil , or at least its lumi nosity should be considerably diminished . When the tube is held exactly over the centre of the coil — the latter being wound in sections and the primary placed symmetrically… … Fig . 124 . middle both halves of the coil neutralize each other , and the electric potential is zero . If the action were electromagnetic , the tube should light best in the plane through the centre of the coil , since the electromagnetic effect there should be a maximum . When an arc is…
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