Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 12

and p2. To illustrate, the relays R¹ R² may be regulated either by adjusting the weights of the levers 11 1, or the strength of the batteries 2, or the resistances or otherwise, so that, when a certain order of succession or difference of phase between the discharge of the primary circuits Pl and P2 exists at the sending station, the levers 1¹ and 12 will close the contacts at the same instant, and thus operate the relay R³, but will fail to produce this result when the order/of succession is a different one. This insures a greater safety against disturbances from other sources and permits, on the other hand the operation of signalling by merely varying the order of succession of the impulses. Instead of closing and opening the circuit of the source S, as before stated, for the purpose of sending distinct signals, it will be sufficient to merely alter the period of either of the transmitting circuits arbitraril varying the inductance of one of the primaries. arbitrarily in any of the well-known ways, as by Obviously there is no necessity for using transmitters with two or more distinct elements or circuits at the same station, since a succession of waves or impulses of different characteristics may be produced by an instrument having but a single circuit. single A few of the many ways which will readily suggest themselves to the expert who applies ny invention, are illustrated in Figs. 3, 4 and 5. Ir. Fig. 3 a transmitting system e s³ ³ 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 conductor 3, or, if desired, bridges it by an adjustable condenser C3, thus altering the vibration of the -8569