Nikola Tesla - Free-Energy Devices

42 INVENTIONS OF NIKOLA TESLA.If transformers be employed, one set of the primary coils, asN N, wound on a ring or annular core is connected to one circuit,as M', and the other primary coils, N N', to the circuit M. Thesecondary coils K K' may then be utilized for running groups ofincandescent lamps p p'.With this generator an exciter is employed. This consists ofFIG. 33.two poles, A A, of steel permanently magnetized, or of iron excitedby a battery or other generator of continuous currents, anda cylindrical armature core mounted on a shaft, B, and woundwith two longitudinal coils, c c'. One end of each of these coilsis connected to the collecting-rings I c, respectively, while the