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 445
netism that might result in the permanent magnet by the action of heat . Mr . Tesla also provides for lessening the volume of the heat or for intercepting the same during that portion of the reciprocation in which the cooling action takes place . In the diagrams are shown some of the numerous… … Fig . 383 . Fig . 333 . Fig . 331 tion m , and the spring or the equivalent thereof — namely , a weight — is marked w . In Fig . 231 the permanent magnet x is connected with a frame , f , supporting the axis m , from which the arm j > hangs , and at the lower end of which the armature a is…
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