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 417
scent lamp bulb . The primary , usually consisting of a few turns of thick , well - insulated copper sheet was inserted within the tube , the inside space of the bulb furnishing the secondary . This form of apparatus was arrived at after some experimenting , and was used principally with the view… … Fig . 210 . there w * as no special difficulty in exciting a luminous circle or cylinder in proximity to the primary . As to the number of turns , I cannot quite understand why Prof . J . J . Thomson should think that a few turns were “ quite sufficient, ” but lest I should impute to him an opinion…
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