Nikola Tesla - Free-Energy Devices

PERSONAL EXHIBIT AT THE WORLD?8 FAIR. 479A smaller ring, shown at B, was arranged like the one exhibitedat A but designed especially to exhibit the rotation of anarmature in a rotating field. In connection with these tworings there was an interesting exhibit shown by Mr. Tesla whichconsisted of a magnet with a coil, the magnet being arranged torotate in bearings. With this magnet he first demonstrated theidentity between a rotating field and a rotating magnet the; latter,when rotating, exhibited the same phenomena as the rings whenthey were energized by currents of differing phase. Anotherprominent exhibit was a model illustrated at c which is a twophasemotor, as well as an induction motor and transformer. Itconsists of a large outer ring of laminated iron wound withtwo superimposed, separated windings which can be connectedin a variety of ways. This is one of the first models used byMr. Tesla as an induction motor and rotating transformer. Thearmature was either a steel or wrought iron disc with a closedcoil. When the motor was operated from a two phase generatorthe windings were connected in two groups, as usual. Whenused as an induction motor, the current induced in one of thewindings of the ring was passed through the other winding onthe ring and so the motor operated with only two wires. Wheniised as a transformer the outer winding served, for instance, asa secondary and the inner as a primary. The model shown atD is one of the earliest rotating field motors, consisting of a thiniron ring wound with two sets of coils and an armature consistingof a series of steel discs partly cut away and arranged on a smallarbor.At E is shown one of the first rotating field or induction motorsused for the regulation of an arc lamp and for other purposes. Itcomprises a ring of discs with two sets of coils having differentself-inductions, one set being of German silver and the other ofcopper wire. The armature is wound with two closed-circuitedcoils at right anglesto each other. To the armature shaft arefastened levers and other devices to effect the regulation.At Fis shown a model of a magnetic lag motor this embodies a castingwith pole projections protruding from two coils between;which isarranged to rotate a smooth iron body. When an alternatingcurrent is sent through the two coils the pole projectionsof the field and armature within it are similarly magnetized, andupon the cessation or reversal of the current the armature andfield repel each other and rotation is produced in this way.