Nikola Tesla Patents
528 Bictral - 2 one in the ground and the other in the air, preferably at some height, as hereinbefore stated. If but one plate is connected to Earth and the other maintained at an elevation, the location of the apparatus must be determined with reference to the position of the stati onary waves established by the generator, the effect evidently being greatest at the maximum point and zero at the nodal points. On the other hand, if both terminals be connected to Earth, the points of connection must be selected with reference to the difference of potential which it is desired to secure, the strongest effect peing, of cour sa, obtained when the plates are at a distance equal to half the wave length. In illustration of the operation of the system, let it be assumed that alternating electrical impulses from the generator are caused to produce stationary waves in the Earth, as above described, and that the receiving apparatus is properly located with reference to the position the of nodal and central regions of such waves. The speed ^ of rotation of the cylinder D is varied until it is made to turn in synchronism with the alternate impulses of the generator, and the position of the brushes b and bis adjusted by angular displacement, or otherwise, so that they are in contact with the segments S and S¹ during the periods when the impulses are at, or near, the maximum of their intensity. The above requirements being fulfilled, electrical charges of the same sign will be conveyed to each of the condenser terminals as the cylinder D is rotated, and with each fresh impulse the condenser will be charged to a -10
