Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 70

684 pressure developed therein coincide with the elevated terminals Dl D2. The two systers may have electrical oscillations impressed upon them in any desired manner, conveniently by energizing them through primaries P² and P2, placed in proximity to them. Adjustable inductances L1 and 12 are preferably included in the primary circuits chiefly for the purpose of regulating the rates of the primary oscillations. In the drawing these primaries Pl and P2 surround the coils. s1 s2, and are joined in series through inductances 1¹ 12, conductor F, condensers cl and C2, brush holders B1 and 22 the A and a toothed disk D, which is connected to the conductor F to and, if desired, also the ground plate E, as shown, two independent primary circuits being thus formed. densers Cl and C2 are of such capacity and the inductances L1 and 12 are so adjusted that each primary is in close resonance with its secondary system, as I have explained. in other patents granted to me. The brush holders Bl and B2 are capable independently of angular and, if necessary, also of lateral adjustment, so that any desired order of succession or any difference of timè interval between the discharges occurring in the two primary circuits may be obtained. The condensers being energized from a suitable source S, preferably of high potential, and the disk D being rotated, its projections or teeth pp, coming at periodically recurring intervals in very close proximity to or, as the case may be, in contact with conducting rods or brushes n n, cause the condensers to be discharged in rapid succession through their respective circuits. secondary systems, Dl S1 E and D² s2 E, are set in vibration -5The conIn this matter the two