Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 23

conductors, connected with their inner ends to elevated terminals Dl and D2 respectively, and with their outer ends to an earth plate E. These two coils, conductors or systems Dl s1l E and S2 E have different and suitably chos en periods of vibration and, as pointed out in other patents relative to my system of energy and intelligence transmission, their lengths should be such that the points of maximum pressure developed there in coincide with the elevated terminals D¹ D2. The two systems may have electrical oscillations impressed upon them in any desired manner, conveniently by energizing them through primaries Pl and P2 placed in proximity to them. Adjustable inductances LI and L2 are preferably included in the primary circuits chiefly for the purpose of regulating the rate of the primary oscillations. In the drawing these primaries Pl and P2 surround the coils SS2, and are joined in series through inductances L1 L2, conductor F, condensers Cl and c2, brushholders and B2 and a toothed disk D, which is connected to the ground plate E and conductor F, as shown, two independent primary circuits being thus formed. The condensers. cl and c2 are of such capacity and the inductances I 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 brus h-holders 31 and B2 are capable of angular and, if necessary, also of lateral adjustment, so that any desired order of succession or any difference of phase may be obtained between the discharges. occurring in the two primary circuits. The condensers being energized from a suitable source S, preferably of high potential, and the disk D being rotated, its projections or -5637