Text: [Select] 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 one hundred volts, and that there are one thousand convolutions; then considering any two contiguous points on adjacent convolutions let it be assumed that there exist between them a potential difference of one-tenth a volt. If now, a[nother] conductor be wound parallel with the first conductor and insulated from it, and the end of the first be connected with the starting point of the second, the aggregate length of the two conductors being such that the assumed number of convolutions or turns is the same, viz., one thousand, then the potential difference between any two adjacent points in the first and secopnd wires will be fifty volts, and as the capacity effect is proportionate to the square of this difference, the energy stored in the coil, as a whole will now be two hundred and fifty thousand as great. Following out this principole, I may wind any given coil either in whole or in part, not only in the specific manner herein illustrated, but in a a great variety of ways, well-known in the art, so as to secure between adjacent convolutions such potential difference as will give the proper capacity to neutralize the self-induction for any given current that may be employed.

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Source: 180