Nikola Tesla U.S. Patent 512,340 - Coil for Electro-Magnets Patent Wrapper Page 5

1 ] J 1 J LET 3 13 relatively to the self-induction is very small. POI In order to attain my object and to properly increase the capacity of any given coil, I wind it in such way as to secure a greater difference of potentiel between its adjacent turns or convolutions, and since the energy stored in the coil considering the latter as a condenser -, is proportionate to the square of the potential difference between its adjacent convolutions, it is evident that I may in this way secure by a proper disposition of these convolutions a greatly increased. capacity for a given increase in potential difference. between the tums. I have illustrated diagrammatically in the accompanying drawings the general nature of the plan which I adopt for carrying out this invention. Fig. 1 is a diagram of a coil wound in the ordinary manner; Fig. 2 is a diagram secure the objects of my invention. winding designed Let A, Fig. 1, designate any given coil the spires or convolutions of which are wound upon and insulated from each other. Let it be assumed that the terminals of this coil show a potential difference of 100 yolts, and that there are 1000 con volutions; then consider ing any two contiguous points on adjacent convolutions let it be assumed that there will exist between them a potential difference of one-tenth of a volt. to If now, as shown in Fig. 2, a conductor B be wound parallel with the conduct or A and insulated from -35