Nikola Tesla U.S. Patent 723,188 - Method of Signaling Patent Wrapper Page 8

J ate and to cause the receiver to be actuated and, inas mich as the skill and practical knowledge in these novel fields can only be acquired by long experience, the degree of of safety and perfection attained will necessarily depend on 1 the ability and resource of the expert who applies my in1 vention, but in order to enable the same to be successfully practiced by any person possessed only of the more general 1 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 drawing, in which Fig. 1 and Fig. 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 my invention. In Fig. 1 sl and S2 are two spirally wound coils or conductors, connected with their inner ends to elevated terminals D¹ and D2 respectively, and with their outer ends to an earth plate E. These two coils, conductors or systems D¹ sl E and D² s2 E have different and suitably chosen periods of vibration and, as pointed out in other patents relative to my system of energy and intelligence transmission, their lengths should be such that the points of maximun pressure developed therein coincide with the elevated terminals D¹ D². The two systems may have electrical cscillations impressed upon them in any desired manner, conveniently by energizing them through primaries Pl and p2 > -4placed 565