Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 11

[FLLILLLL LL] 1 inductances L¹ and 1² are preferably included in the primary circuits chiefly for the purpose of regulating the rate of the primary oscillations. In the drawing these primaries. p² and p² surround the coils s² s² and are joined in series. through inductances L¹ L² conductor F, condensers c² and c², brush-holders Band B2 and a toothed disk D, which is connected to the groundplate E and conductor F, as shown, two independent primary circuits being thus formed. The condensers c² and c² are obviously of such capacity and the inductances 1¹ and L² are so adjusted that each primary is in close resonance with its secondary system, as I have repeatedly explained in other patents granted to me. The brush-holders B¹ 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 teeth , coming at periodically recurring intervals in very close proximity to or, as the case 1 may be, in contact with metallic rois or brushes nn, cause the condensers to be discharged in rapid succession through their respective circuits. In this manner the two secondary 11 22 systems, D SE and D´S E, are set in vibration and oscillate freely, each at its proper rate for a certain interval of time after every discharge. The two vibrations are impressed upon the ground through the plate E, and spread to a distance, reaching the receiving station, which has two similar circuits or Cancelle Aubifter. > -5625