Nikola Tesla - Free-Energy Devices

POLYPHASE CURRENTS. 89tor in which by means of one or more alternating currents heliasproduced the rotation or progression of the magnetic poles.This new mode of operation will now be described. Fig. 72is a side elevation of such motor. Fig. 73 is a side elevation ofa more practicable and efficient embodiment of the invention.Fig. 74 is a central vertical section of the same in the plane ofthe axis of rotation.Referring to Fig. 72, let x represent a large iron core, whichmay be composed of a number of sheets or laminae of soft ironor steel. Surrounding this core is a coil Y, which is connectedwith a source E of rapidly varying currents. Let us consider nowFIGS. 72 and 73.the magnetic conditions existing in this core at any point, as 5,at or near the centre, and any other point, as #, nearer the surface.When a current impulseis started in the magnetizing coilY, the section or part at