Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 14

628 bb², or resistances r¹ r², or otherwise, so that, when a 1 certain order of succession difference of phase between the discharges of the primary circuits pl and p2 exists at the sending station, the levers 11 and 12 will close the contacts cl and c2 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, to effect the signalling by merely varying the order of succession of the impulses. In like marmer, 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 arbitrarily in any of the well-known ways, as by varying the It should be stated, furinductance of one of the primaries thermore, in regard to the apparatus illustrated in Fig.2,. that specific and useful results are obtainable by connecting contacts cl and c2 in multiple arc instead of in series, as shown. Obviously there is no necessity for using two distinct transmitters or circuits at the sending station, since a succession of waves or impulses of different characteristics may A few of the many ways which be produced in one single circuit. will readily suggest themselves to the expert who applies my In Fig.3 a invention, are illustrated in Figs. 3, 4, and 5. transmitting system es³d³ is partly shunted by a rotating wheel or disk D3, which may be similar to that illustrated in Fig.l, and which cuts out periodically a portion of the coil or con8