Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 22

3 1 ( T ai i inde pendent primary circuits being this 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 time interval between the discharges occurring in the two primary circuits may be obta ined. The condensers being energized from a suitable source S, preferably of high potential, and the disk D being rotated, its projections or teeth p 2 coming at periodically recurring intervals in very close proximity to or, as the case may be, in contact with conducting rods or brushes nn, cause the condensers to be discharged in rapid succession through their respective circuits. In this manner the two secondary systems, 1 sl E and D2 $2 E, are set in vibration and oscillate freely, each at its proper rate for a certain periods of time at 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 systems esande s22, arranged and connected in the same manner and tuned with the systems at the sending station so that each responds exclusively to one of the two vibrations produced by the transmitting apparatus. The same rules of adjustment are observed with respect to the receiving circuits, care being furthermore taken that the tuning is effected when all the apparatus is connected to the circuits and placed in phaition, as any change may more or less modify the vibration. The con579