Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 10

624 lavelly perhub spec experience, the degree of safety and perfection attained will necessarily depend on the ability and resource of the expert 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 car rying it out, which is at present known to me:. For a better understanding of the subject reference is now made to the drawing which accompanies this specification and forms part of the same, and in which Fig. 1 and Fig.2 represent diagrammatically the circuit connections at the sending and receiving stations, respectively, and Figs.3, 4 and 5 s pecific ways and means which may be resorted to 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 D and D2 respectively, and with their outer ends to an earth-plate E. These two coils, conductors or systems Dls¹E and D2S2E have different and suitably chosen periods of vibration and, as pointed out in other patents relative to my system of energy and intelligence transnission, their length is preferably such that the points of maximum pressure developed in them coincide with the elevated terminals D1D². These two systems may have electrical oscillations impressed upon them in any desired manner, conveniently by energizing them through primaries Pl and p², placed in proximity to them. 4 Adjustable