Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 43

J Surb Spec fib since a succession of waves or inpulses of different charactèristics may be produced by an instrument having but one į such circuit. A few of the many ways which will readily suggest theselves to the expert who applies my invention, In Fig. 3 a transmitare illustrated in Figs. 3, 4 and 5. ting system e s3 d3 is partly shunted by a rotating wheel or disk D3, which may he similar to that illustrated in Fig. 1, and which cuts ont periodically a portion of the coil or conductor a3, or, if desired, hridges it by an adjustable condenser C3, thus altering the vibration of the system e s3 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 system e s4 d4 by periodically short circuiting a secondary through an induction coil 13 and 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 65 d5, this result being produced by inserting periodically a suitable number of turns of an induction coil L4 in series with the oscilh ting system by means of a rotating disk 5 with two projections p5 p5, and three rods or brushes 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 same manner as those of Fig. 1, or in any other convenient way. ponding to each of these cases, the receiving station may be provided with two or three circuits, in an analogous manner to that illustr. ed in Fig. 2, it being understood, of course, that the different vibrations or disturbances emitted by thesender follow in such rapid succession upon Cancell per Lubel pre -9Corres657