Nikola Tesla U.S. Patent 512,340 - Coil for Electro-Magnets Patent Wrapper Page 6

6 Quen 3 it, and the end of A be connected with the starting point of B, the aggregate length of the two conductors being such that the assumed number of convolutions or turns is the same, viz; 1000, then the potential difference between any two adjacent points in A and B will be 50 volts, and as the capacity effect is proportionate 50 volts, to the square of this difference, the energy stored in the coil as a whole will now be 250,000 as great. Following out this principle, I may wind any given coil either in whole or in part, not only in the specific manner herein illustrated, but in a great variety of ways, well-known in the art, so as to secure between adjacent convolut íons such potential difference as will give the proper capacity to neutralize the selfinduction for any given current that may be employed. Capacity secured in this particular way possesses an additional advantage in that it is evenly distributed, a consideration of the greatest importance in many cases, and the results, both as to efficiency and economy, are the more readily and easily obtained as the size of the coils, the potential difference, or frequency of the currents are increased. Coils composed of independent strands or conduct ors wound side by side and connected in series are not in themselves new, and I do not regard a more detailed description of the same as necessary. But heretofore, so far as I am aware, the objects in view have been essentially different from mine, and the results which I obtain even if an incident to such forms of wind-4