Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 35

JLJJ) L 3 13 13 LJUDICTUJUJULIJ When practical conditions render it necessary to use a larger terminal than can be conveniently made of one piece of metal or with a perfectly smooth and unbroken surface, 1 construct it of a plurality of elements each having a suitably large radius of curvature. A very desirable construction in such cases is that shown in Fig. 5, in which F F are insulating supports, upon which the terminal D is moun ted. The latter consists of a metallic frame in the form of a ring of nearly circular cross section, which is covered with small half spherical metal plates p p connected together, thus constituting a conducting surface curved and smooth at all places where the electrical charge principally accumulates. The supports F F should penetrate far into the hollow space formed. the terminal, and if the electrical surface density at the points where they are bolted to the metallic. frame is not small enough, they may be specially protected by conducting hoods, as before described. The transmitting circuit consists of a spirally wound conductor A B, one end of which is connected to a ground. plate and the other through a metallic cylinder B' to the center of terminal D. The connection should always be made so as to secure a symmetrical distribution of the current flowing into and out of the terminal, as otherwise, in cases when the frequency is very high and the currents. of large volume, the performance of the apparatus might be impaired. The transmitting circuit referred to may be excited in any desired manner, as by a primary C, energized from a suitable source of currents G, which may be an alternator or condenser, the important requirement being that the resonant 371-6 35 -51 con731