Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 73

1 J J T J J 5-9 such transmitting systems or circuits, and thus any desired safety against exdegree of exclusiveness or privacy and The apparatus as treneaus disturbances may be attained. illustrated in Figs. 1 and 2 permits, however, special results to be secured by the adjustment of the order of succession of the discharge of the primary circuits Pl and To 11P2, or of the time interval between such discharges. lustrate, the action of the relays, R1 R2 may be regulated either by adjusting the weights of the levers 11 12, or the strength of the batteries 2, or the resistances , or in other well known ways, so that, when a certain order of succession or time interval between the discharges of the primary circuits pl and P2 exists at the sending station, the levers 11 and will close the contacts and at the same instant, and thus operate the relay R3, but it will fail to produce this result when the order of succession of cr the time interval between the discharges in the primary circuits is another one. By these or similar means additional safety against disturbances from other sources may be afforded of attained, and, on the other hand, the possibility effecting the operation of signalling by varying the order of succession of the discharges of the two circuits. stead of closing and opening the circuit of the source S, as before indicated, for the purpose of sending distinct signals, it may be convenient to merely alter the period of either of the transmitting circuits arbitrarily, as by varying the inductance of the primaries. Obviously there is no necessity for using transmitters. with two or more distinct elements or circuits as S1 and s², -6In687