Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 25

582 ai Cancelled Dr Subbsper, Jul 31 BI 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 prinary 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 sign lling by varying the order of succession of the discharges of the two circuits. Instead of closing and opening the circuit of the source S, as before indicated, for the purpose of sending distinct sicnals, 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 and s2 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 illustrated in Figs. 3, 4 and 5. In Fig. 3 a transmitting system e s3 d3 is partly shunted by a rotating wheel or disk D3, which may be similar to that illustrated in Fig. 1, and which cuts out periodically a portion of the coil or donductor 3, or, if desired, bridges it by an adjustable condenser C3, thus altering the vibration of the system e d3 at suitable intervals and causing two distinct kinds or classes of impulses to be emitted in rapid succession by the sender. In Fig. 4 a similar result is produced in, the systemes d by periodically short circuiting a second-2