Nikola Tesla - Free-Energy Devices

HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 375In the aecompaning engravings, Figs. 199 and 200 show themachine, respectively, in side elevation and vertical cross-section ;Figs. 201, 202 and 203 showing enlarged details of construction.As will be seen, A is an annular magnetic frame, the interior ofwhich is provided with a large number of pole-pieces D.Owing to the very large number and small size of the polesand the spaces between them, the field coils are applied by windingan insulated conductor F zigzag through the grooves, as shownin Fig. 203, carrying the wire around the annulus to form asD will bemany layers as is desired. In this way the pole-piecesenergized with alternately opposite polarity around the entirering.For the armature, Mr. Tesla employs a spider carrying a ringj, turned down, except at its edges, to form a trough-like receptaclefor a mass of fine annealed iron wires K, which are woundin the groove to form the core proper for the armature-coils.Pins L are set in the sides of the ring j and the coils M are woundover the periphery of the armature-structure and around the pins.The coils M are connected togetherin series, and these terminalsN carried through the hollow shaft H to contact-rings P P, fromwhich the currents are taken off by brushes o.In this way a machine with a very large number of poles maybe constructed. It is easy, for instance, to obtain in this mannerthree hundred and seventy-fiveto four hundred polesin a machinethat may be safely driven at a speed of fifteen hundred or sixteenhundred revolutions per minute, which will produce ten