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I answered some 1 who asked what 1 would gain by using 2 × voltage, I said that = 2 × the power, but that = only a rise in speed of 10 to 13. Now I see that if 1 goes @ the same speed as before, 1 gets the square root of 2, or about 1·4 × the power. (as well as the 2× voltage being used ½ the...