Nikola Tesla - Free-Energy Devices

334 INVENTIONS OF NIKOLA TE8LA.for operating a certain class of alternating motors founded on theaction of currents of differing phase. In view of the presentstate of the art it isthought sufficient to describe these arrangementsin a few words only. The diagram, Fig. 180 II., showsa primary coil P, connected with one of its ends to the line L leadingfrom a high tension transformer terminal TJ. In inductiverelation to this primary P is a secondary s of coarse wire in thecircuit of which is a coil c. The currents induced in the secondaryenergize the iron core which is ?', preferably, but not necessarily,subdivided, and set the metal disc d in rotation. Such amotor M 2as diagramatically shown in Fig. 180 II., has beencalled a " magnetic lag motor," but this expression may be objectedto by those who attribute the rotation of the disc to eddycurrents circulatingin minute paths when the core i isfinallysubdivided. In order to operate such a motor effectively on theplan indicated, the frequencies should not be too high, not morethan four or five thousand, though the rotation is produced evenwith ten thousand per second, or more.In Fig. 180 I., a motor M thaving two energizing circuits, A andB, is diagrammatical ly indicated. The circuit A is connected tothe line L and in series with it is a primary p, which may have itsfree end connected to an insulated plate p l5such connectionbeing indicated by the dotted lines. The other motor circuit Bis connected to the secondary s which is in inductive relation tothe primary p. When the transformer terminal T is t alternatelyelectrified, currents traverse the open line L and also circuit A andprimary p. The currents through the latter induce secondarycurrents in the circuit s,which pass through the energizing coilB of the motor. The currents through the secondary s and thosethrough the primary p differ in phase 90 degrees, or nearly so, andare capable of rotating an armature placed in inductive relationto the circuits A and B.In Fig. 180 III., a similar motor M 3 with two energizing circuitsA! and B! is illustrated. A primary p, connected with oneof its ends to the line L has a secondary s, which is preferablywound for a tolerably high E. M. r.,and to which the two energizingcircuits of the motor are connected, one directly to theends of the secondary and the other through a condenser c, by theaction of which the currents traversing the circuit A tand B taremade to differ in phase.In Fig. 180 IV., still another arrangementis shown. In thiscase two primaries p tand P 2 are connected to the line L,one