Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 17

3 do Cancelled рекрив прес. do of distinct impulses or disturbances, of sensitive circuits at the receiving point or station each adapted to respond to the impulses or disturbances of one series, and a receiving apparatus, dependent for operation upon the conjoint action of the sensitive circuits, as set forth. 5. In a system for the transmission of electrical impulses through the natural media and the operation or control of signalling or other apparatus thereby, the combination with a transmitting apparatus adapte to produce two or more series. of distinct electrical impulses or disturbances, of means for varying the relations of the several series, sensitive circuits each adapted to respond to the impulses or disturbances of one series and a receiving apparatus dependent for operation upon the conjoint action of the sensitive circuits, as set forth. \ 6. In a system of the kind described, the combination. with a transmitter adapted to produce a plurality of series of distinct electrical impulses or disturbances, of a receiving apparatus, comprising a plurality of circuits each containing a sensitive device and a relay and adjusted to respond to the impulses or disturbances of one kind, and a receiver or relay dependent upon the simultaneous operation of the several sensitive circuits, as set forth. 7. The special construction of the apparatus, herein shown and described. John C. Kard Richard S. Ionoman. -11Nikole Tesle [This page retyped from microfilm for better readability - Ed.] 631