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 392
r observation of any kind in the domain of this wonderful science which would not forcibly appeal to us . Yet to me it seems , that of all the many marvelous things we observe , a vacuum tube , excited by an electric impulse from a distant source , bursting forth out of the darkness and… … Fig . 198 . ber and waving the tube about we produce all kinds of designs in luminous lines . So by way of amusement I take a straight long tube , or a square one , or a square attached to a straight tube , and by whirling them about in the hand , I imitate the spokes of a wheel , a Gramme winding…
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