Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 12

708 a single shell, notwithstanding its small linear dimensions and capacity. The wire c should be heavily insulated, for it will be charged to a much greater density than the terminal, and outside of the latter it should be, preferably, kept away from the insulating support b to avoid sparks and damage. It may be useful to remark that rubber insulation should not be employed, as it might be rapidly deteriorated, and that the conductor should be of as large a diameter as practicable in order to obtain a larger surface and so reduce the density. A modified embodiment of the invention is illustrated in Fig. 2, in which d represents a cylindrical terminal partly cut off, which is mounted on an insulating support. b and connected to the high tension circuit through a heavily insulated wire c'. A conducting shell or hood a' in contact with the terminal d' is placed so as to surround the upper end of the support b' as indicated, and in this way serves, like the hood a in Fig. 1, for preventing the leakage of electricity to the ground. So also in such cases as that shown in Fig. 3, when ropes kk are necessary for steadying a similar terminal d², the tendency of thehigh potential charge to escape along them may be prevented by placing a conducting shell or hood. over the collar 1, to which they are fastened. Still another valuble application of the invention is illustrated in Fig. 4, in which a3 represents a shell with rounded contours and a smooth conducting outer surface secured to an ordinary post b2 in any onvenient manner. As stated with reference to Fig. 1, the former may be of any kind of material with a conducting coating on the outside. 9 371-20