Nikola Tesla Patents
J J 1 JI DELL Still another way, which has also been known for many years, is to pass, in any suitable manner, a current through a portion of the ground, as by connecting. to two points of the same, preferably at a considerable distance from each other, the two terminals of a generator, and to energize by a part of the current diffused and through the earth, a distant circuit which is similarly arranged and grounded at two points widely apart and which is made to act upon a sensitive receiver. These various methods have their limitations, one especially, which is common to all being that the receiving circuit or instrument must be maintained in a definite position with respect to the transmitting apparatus, which often imposes great disadvantages upon the use of Cancelled per Sub Spec. the apparatus. In several applications filed by me and patents granted to me, I have disclosed other methods of accomplishing results of this nature which may be briefly described as follows: electrical disturbances, In one system the potential of a point or region of the earth is varied by imparting to it intermittent or alternating electrifications through one of the terminals of a suitable source of which, to heighten the effect, has its other terminal connected to an insulated body, preferably of large surface and at an elevation. The electrifications communicated to the earth spread in all directions through the same, reaching a distant circuit, which generally has its terminals arranged and connected similarly to those of the transmitting source and operates upon a highly sensitive receiver. 1 This page retyped from microfilm for better readability - Ed. 325
