Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 24

638 Syntonized. teeth, coming at periodically recurring intervals in very close proximity to or, as the case may te, in contact with conducting rods or brushes n n, cause the condensers to be discharged in rapid succession through their respective circuits. In this manner the two secondary systems, Dl s¹ E and D2 S2 E, are set in vibration and oscillate freely, cach at its proper rate for a certain interval 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 synchronized with the systems at the sending station, so as to respond each exclusively to one of the two vibrations of one kind or class produced by the transmitting apparatus! The same rules of adjustment are observed in the receiving circuits, care being furthermore taken that the synchronizing is effected when all the apparatus is connected to the circuits and placed in position, as any change may more or less modify the vibration. Each of the receiving coils and s2 is shunted by a local circuit containing, respectively, sensitive devices a, batteries , adjustable reistances rr, and sensitive relays R1 R2, all joined in series, as shown. The precise connections and arrangements of the various instruments are largely immaterial, and may be varied in many ways. The sensitive devices a and a² may be any of the well known devices ordinarily used, as for example, two conducting terminals separated by a minute air-gap or thin film of dielectric, which is strained or weakened by a battery or other me ans to the point of breaking down, and gives way -6Portion of margin notes not legible - Ed.]