A turning mechanism is adapted to a projector including a base and a zoom lens set in a base for turning a zoom bar of the zoom lens. In one embodiment, the hybrid system includes a cathode, an electrolyte, and a plurality of anode portions. This method may include providing a work arm having a working end positioned to repetitively move about a predetermined path of a work surface. In particular, the nominal temperature is at an extremum of a temperature dependence of the permeability number.