Nikola Tesla Patents
538 Pu B results and certain theoretical deductions led me to the conclusion, that waves of this kind may be propagated in all directions over the globe, and that they may be of still more widely differing lengths, the extreme limits being imposed by the physical dimensions and properties of the Earth. Recognizing in the existence of these waves an unmistakable evidence, that the disturbances created had been conducted from their origin to the most remote portions of the globe and had been thence reflected, I conceived the idea of producing such waves in the Earth by artificial means, with the object of utilizing them for many useful purposes, for which they are, or might be found applicable. This problem was rendered extremely difficult, owing planet I to the immense dimensions of the globe and consequently enorA mous movement of electricity, or rate at which electrical enery had to be delivered in order to approximate, even in a remote degree, movements or rates which are manifestly attained in the displays of electrical forces in nature, and which seemed at first unrealizable by any human agencies. But by gradual and continuous improvements of a generator of electrical oscillations, which I have described in my patents Nos. 645,576 and 649,621 I finally succeeded in reaching electrical movements, or rates of delivery of electrical energy, not only approximating but, as shown in many comparative tests and measurements, actually surpassing those of lightning discharges, and by means of this apparatus I have found it possible to reproduce, whenever desired, phenomena in the Earth the same as, or similar to those due to such discharges. With the knowledge of the phenomena discovered by me -3
