Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 5

562 Lavelly To all whom it may concern:- Be it known that I, Nikola Tesla, a citizen of the United States, residing in the Borough of Manhattan, in the City, County and State of New York, have invented certein new and useful improvements in Methods of Signalling, of which the following is a specification, reference being had to the drawings accompanying and forming a part of the lub. same: mog Sapporgand This application is a division of an application filed by me on the 16th day of July 1900, Serial No. 23,847. In certain systems for transmitting intelligible messages, or governing the movements and operations of distant automata electrical impulses or disturbances, produced by suitable apparatus, are conveyed through the natural media to a receiving circuit, capable of responding to the impulses and thereby effecting the control of other appliances. Generally a special device, highly sensitive, connected to he receiving circuit which, in order to render it still more susceptible, and in order to reduce, the liability of its being affected by extraneous disturbis carefully synchronized with the transmitter. By Va a scientific design of the sending and receiving circuits and other apparatus, and skillful adjustment of the same, these objects may be in a measure attained, but in long experience I have found that notwithstanding all constructive advantages and experimental resources, this method is in many cases inadequate. Thus, while I have succeeded in so operating, selectively, under certain favorable conditions, more than one hundred receivers, in most cases it is practicable to work successfully but a few, the number rapidly ances, -1