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 193
e melted wax and boiled for a long time until the hubbies cease to appear . The whole is then left to cool down thoroughly , and then the mass is taken out of the vessel and turned up in a lathe . A coil made in this manner and with care is capable of withstanding enormous potential differences .… … Fig . 113 . be found that , after all , a vessel filled with oil is not a very con venient thing to handle in a laboratory . If an ordinary coil can be dismounted , the primary may be taken out of the tube and the latter plugged up at one end , filled with oil , and the primary reinserted . This…
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