Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 69

J J T C 3 Evidently there are a great many ways of generating impulses or disturbances of any wave length, wave form, number or order of succession, or of any special character, such as will be capable of fulfilling the requirements above stated, and there are also many ways in which such impulses or disturbances may be made to cooperate and to cause the receiver to be actuated and, inasmuch as the skill and practical knowledge in these novel fields can only be acquired by long experience, the degree of safety and perfection attained will necessarily depend upon the ability and resource of thexpert who applies my invention, but in order to enable the same to be successfully practiced by any person possessed only of the more general knowledge and experience in these branches, I shall describe the simplest plan. of carrying it out, which is at present known to me. For a better understanding of the subject reference is now made to the accompanying drawings in which Figures 1 and. 2 represent diagrammatically the apparatus and circuit connections employed at the sending and receiving stations respectively, and Figs. 3, 4 and 5 modified means which may be employed in the practical application of the invention. In Fig. 1 s¹ and 52 are two spirally wound coils or conductors, connected with their inner ends to elevated terminals Dl and D2 respectively, and with their cuter ends to an earth plate E. These two coils, conductors or systems D1 s E and D2 S2 E have different and suitably chosen periods of vibration and, as pointed out in other patents relating to my system of energy and intelligence transmission, their lengths should be such that the points of maximum -4683