Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 68

764 that an increase of the capacity entails a lowering of the frequency of the impulses or discharges and a diminuation of the energy of vibration. This will be understocd when it is borne in mind, that a circuit with a large capacity behaves as a slack spring, whereas one with small capacity acts like a stiff spring, vibrating more vigorously. Therefore, in order to attain the highest possible frequency, which for certain purposes is advanfrom tageous and, apart of that, to develop the greatest energy ^ in such a transmitting circuit, I employ a terminal of relatively small capacity, which I charge to as high a pressure as practicable, To accomplish this result I I have found it imperative to so construct the elevated conductor, that its outer surface, on which the electrical charge chiefly accumulates, has itself a large radius of curvature, or is composed of separate elements which, irrespective of their own radius of curvature, are arranged in close proximity to each other and so, that the outside ideal surface enveloping them is of a large radius. Evidently, radius of curvature the greater, for a given electric displacement, will be the surfacedensity and, consequently, the lower the limiting pressure to which the terminal may be charged without electricity escaping into the air. smaller Such a terminal I secure to an insulating support entering more or less into its interior, and I likewise connect the circuit to it inside or, generally, at points where the electric density is small. This plan of constructing and supporting a highly charged conductor I have found to be of great practical importance, and it may be usefully applied in many ways, as will be seen from the accompanying drawing, in which 37166 70 Per & (2)