Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 70

766 and outside of the latter it should be, preferably, kept away from the insulating support b to avoid sparks and danage 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 & dieneter 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'end connected to the high tension circuit through a heavily insulated wire c'. A conducting shell or hood ¹ 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 alse in such cases as that shown in Fig. 3, when ropes kare necessary for steadying a similar terminal a2, the tendency of the high potential charge to escape along them may be prevented by placing a conducting shell or hood a² over the collar 1, to which they are fastened. Still another valuable application of the invention is illustrated in Fig. 4, in which a represents a shell with rounded contours and a smooth conducting outer surfaces secured to an ordinary post b2 in any convenient nanner. As stated with reference to Fig. 1, the former ney be of any kind of material with a conducting coating on the outside. The high tension wire c² is fastened to the shell ³ as usual, care being taken, however, to establish a good electrical contact between both, as otherwise sparks will form, which may cause heating and damage. For the better understanding of the function of the device atten68 (4) 3 72 37/