Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 52

1 ) 亏 turbances may be attained. The apparatus as illustrated in Figs. 1 and 2 permits, however, special results to be secured by the adjustment of the order of succession of the discharges of the primary circuits pl and p2, or of the time intervals. between such discharges. To illustrate, the action of the relays R¹ R2 may be regulated either by adjusting the weights of the levers 1 12, or the strength of the batteries bl b², or the resistances r¹ r2, 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 12 will close the contacts and at the same instant, and thus operate the relay R3, but will fail to produce this result when the order of succession of, or 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 attained and, on the other hand, the possibility afforded of effecting the operation of signalling by varying the order of succession of the discharges of the two circuits. Instead of closing and opening the circuit. of the source s¹, 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 Sl and $2, since a succession of waves or impulses of different characteristics may be produced by an instrument having but one such circuit. A few of the many ways which will readily suggest themselves to the expert who applies my invention, are illus-8609