Nikola Tesla Patents
2 Sub. Spec. mospheric air, which behaves as an excellent insulator to currents generated by ordinary apparatus, becomes a conductor under the influence of currents or impulses of enormously high electro-motive force which I have devised means for generating. By such means air strata, which are easily accessible, are remi sred available for the production of many desired effects at distances, howe ver great. This method, furthermore, allows advantage to be taken of many of those improvements which are practicablÉ™ in the ordinary systems of transmission involving the use of a metallic conductor. Obviously, whatever mathod be employed, it is desirable that the disturbances produced by the transmitting appara tus should be as powerful as possible, and by the use of certain forms of high-frequency apparatus which I have devised and which are now well known, important practical advantages are in this respect secured. Furthermore, since in most cases the amount of energy conveyed to the distant circuit is but a minute fraction of the total energy emanating from the source, it is necessary for the attainment of the best results that, whatever the character of the receiver and the nature of the disturbances, as much as possible of the energy conveyed should be made available for the operation of the receiver, and, with this object in view, I have here tofcre, among other means, employed a receiving circuit of high salf-induction and very small resistance and of a period such as to vibrate in synchronism with the disturbances, whereby a number of separate impulses from the source were made to co-operate, -4333
