Nikola Tesla - Free-Energy Devices

A UXILIAR T Bit USE REG ULA TION. 443of ordinary construction.It will have been seen from what wassaid already that when the electro-motive force between the brushesa and c is to the electromotive force between the brushes cand b as the resistance of the circuit a M c' c A is to the resistanceof the circuit b c B c c' D, the potentials of the pointsa? and ywill be equal, and no current will pass over the auxiliary brushc; but if that brush occupies a different position relatnely to themain brushes the electric condition is disturbed, and currentwill flow either from y to x or from a? to y, according to the relativeposition of the brushes. In the first case the current throughthe field-helices will be partly neutralized and the magnetism ofthe field magnets will be diminished. In the second case thecurrent will be increased and the magnets gain strength. Bycombining with the brushes a 1) c any automatic regulatingmechanism, the current developed can be regulated automaticallyin proportion to the demands of the working circuit.In Figs. 264 and 265 some of the automatic means are representedthat may be used for moving the brushes. The core P,Fig. 264, of the solenoid-helix s is connected with the brush c tomove the same, and in Fig. 265 the core P is shown as within thehelix s,and connected with brushes a and c, so as to move thesame toward or from each other, according to the strengthof thecurrent in the helix, the helix being within an iron tube, s', thatbecomes magnetized and increases the action of the solenoid.In practice it is sufficient to move only the auxiliary brush, asshown in Fig. 264, as the regulationisvery sensitive to theslightest changes but the relative;position of the auxiliary brushto the main brushes may be varied by moving the main brushes,or both main and auxiliary brushes may be moved, as illustratedin Fig. 265. In the latter two cases, it will be understood, themotion of the main brushes relatively to the neutral line of themachine causes variations in the strength of the current independentlyof their relative position to the auxiliary brush. Inall cases the adjustment may be such that when the machine isrunning with the ordinary load, no current fiows over the auxiliarybrush.The field helices may be connected, as shown in Fig. 25!>, or apart of the field helices may be in the outgoing and the other partin the return circuit, and two auxiliary brushes may be employedas shown in Figs. 261 and 262. Instead of shunting the wholeof the field helices, a portion only of such helices maybe shunted,as shown in Figs. 260 and 262.