Nikola Tesla - Free-Energy Devices

A UXILIARY BRUSH REG ULATWN. 44~>auxiliary brush or brushes to divide the sensitiveness when the'brushes are adjusted.The accompanying sketches also illustrate improvements madeby Mr. Tesla in the mechanical devices used to effect the shiftingof the brushes, in the use of an auxiliary brush. Fig. 266 isan elevation of the regulator with the frame partly in section ;and Fig. 267 is a section at the line a? a?, Fig. 266. c is the commutator;B and B', the brush-holders, B carrying the mainbrushes a a' ,and B' the auxiliary or shunt brushes b b. Theaxis of the brush-holder B is supported by two pivot-screws, JP />.The other brush-holder, B', has a sleeve, d, and is movablearound the axis of the brush-holder B. In this way both brushholderscan turn very freely, the friction of the parts beingreduced to a minimum. Over the brush-holders is mounted thesolenoid s,which rests upon a forked column, c. This columnFIG. 264. Fro. 265.also affords a support for the pivots p p, and is fastened upon asolid bracket or projection, p, which extends from the base ofthe machine, and is cast in one piece with the same. Thebrush-holders B B' are connected by means of the links e eand the cross-piece F to the iron core i,which slides freely in thetube T of the solenoid. The iron core i has a screw, s, by meansof which it can be raised and adjusted in its position relativelyto the solenoid, so that the pull exerted upon it by the solenoidis practically uniform through the whole length of motion whichis required to effect the regulation. In order to effect theadjustment with greater precision, the core i is provided with asmall iron screw,s'. The core being firstbrought very nearlyin the required position relatively to the solenoid by means ofthe screw s,the small screw s' is then adjusted until the magneticattraction upon the core is the same when the core is in any posi.tion. A convenient stop, ,serves to limit the upward movementof the iron core.