Nikola Tesla Patents
296 One of these weys consists in producing, by a suitable apparatus, rays or radiations, that is, disturbances, which are propagated in straight lines through space, directing them upon a eceiving or recording apparatus at a distance, and there by bringing the latter into action. This method is the oldest and best known, and has been brought particularly into prominence in recent years through the investigations of Heinrich & Hertz.. ts limitations are self-evident, the chief being found in the inability of the rays to pass through ordinary obstacles and in the fact that their energy diminishes, as a rule, very rapidly with the distance owing to the great absorption of the energy which takes place in their transit through the media. This, and the difficulty of producing an economical source of Sul. Sien Cancelled adequate power, has made it, so fer, impracticable to concenper trate a sufficient amount of energy upon the receiver when it is at any very considerable distance from the source. раде? art Harty out. Sub. B out 5 art magnatic boduction Another method consists in passing a current through a circuit, preferably one enclosing a very large area, inducing thereby in a similar circuit situated at a distance, another 20 current, and affecting by the same, in any convenient way, a receiving device. This method has also been known for a long time and, while it is necessarily subject to certain serious disadvantages, it offers a number of decided advantages. Under conditions frequently occurring in practice the energy of the impulses transmitted diminishes much less with the distance than in the former case, and, there being no difficulty i energizing powerfully the transmitting circuit a receiver can be easily operated at a distance of several miles. Furthermore, the circuits are readily synchronized, and ordinary obstacles do not materially interfere with the transmission of the impuses. the rapid diminution of the energy of the impulses as the dis2 But
