Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 348
eld due to armature reaction pro-duced by the ampere-turns OIa. Then O C must be the SUPPLY VOLTAGE CONSTANT. 329 field impressed by the current in-the magnet coils, andO Ic the corresponding ampere-turns, the angles O C Icand OAIa being, of course, equal. The armatureampere-turns are proportional… … ture current, and since the former is constant, and thelatter proportional to O A = B (7, we find that the lineB C may be made to represent directly the torque if thescale be suitably chosen. The length of this line repre-sents, therefore, two things, namely, speed and torque,from which it follows…
Electric power production
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