Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 101

1 T 1 T T Per Efs Amote 62 the apparatus has been brought under perfect control. To increase the safety, I provide on a convenient place, preor ferably on terminal D, one of more elements or plates 1 either of somewhat smaller radius of curvature or protruding more or less beyond the others (in which case they may be of larger radius of curvature) so that, should the pressure rise to a value, beyond which it is not desired to go, the powerful discharge may dart out there and lose itself harmlessly in the air. Such a plate, performing & function similar to that of a safety valve on a high pressure reservoir, is indicated at V. 12977 Still further extending the principles underlying my invention, special reference is made to coil B and conductor B'. The latter is in the form of a cylinder with smooth or polished surface of a radius much larger than that of the half spherical elements and widens out at the bottom into a hood H, which should be slotted to avoid loss by eddy currents and the purpose of which will be clear from the foregoing. The coil B is waund on a frame or drum D¹ of insulating material, with its turns close together. I have discovered that when so wound the effect of the small radius of curvature of the wire itself is overcome and the coil behaves as a conductor of large radius of curvature, corresponding to that of the drum. This feature is of considerable practical importance and is applicable not only in this special instance, but generally. For example, such plates as of terminal D, though preferably of large radius of curvature, need not be necessarily so, for provided only that the individual plates or elements (5) 103 797