Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 26

ar ary through an induction coil I end a rotating disk D4 with insulating and conducting segments, or otherwise. Again, in Fig. 5 three distinct vibrations are caused to be emitted by a system e 5 d5, this result being produced by inserting periodically a suitable number of turns of an induction coil 14 in series with the oscillating system by 1 means of a rotating disk 35 with two projections p5 p5, and three rods or brustes n5, placed at an angle of 120 degrees relatively to each other. The three transmitting systems or circuits thus produced may be energized in the sane marmer as those of Fig. 1, or in any other convenient way. Corresponding to each of these cases, the receiving station may be provided with two or three circuits, in a analogous manner to that illustrated in Fig. 2, it being understood, of course, that the different vibrations or disturbances emitted by the sender follow in such rapid succession upon each other that they are practically simultaneous, so far as the operation of such relays as R¹ and R2 is concerned. Evidently, however, it is not necessary to employ two or more receiving circuits, but a single circuit may be used also at the receiving station constructed and arranged like the transmitting circuits. or systems illustrated in Figs. 3, 4 and 5, in which case the corresponding disks, as D3 D4 D5, at the sendirg, will be driven in synchronism with those at the receiving stations as far as may be necessary to secure the desired result. But whatever the nature of the specific devices employed, it will be seen that the fundarental idea in my invention is the operation of a receiver by the conjoint or resultant effect of two or more circuits, circuits, each tuned to respond exclusively to waves, impulses or vi-9583