International Library of Technology · Scranton, International Textbook Co. · leaf 49
is laid out in Fig. 1354, and the re-quired value of the ampere-turns for any magnetic circuitcan be read off at once, being simply dependent, for anygiven metal, upon the length of circuit and the density ofthe lines cf force. Suppose, for example, a wrought-ironring has a circumference of 6… … 10000 SO 100 150 ZOO 250 Ampere—Turna per Inch Length, Fig. 1354. 300 137 X G = 822 ampere-turns. The figure 137 is found at theintersection of the ordinate 100,000 with the curve marked DYNAMO-ELECTRIC MACHINE DESIGN. 2425 Wrought-Iron Forgings, by following the vertical linedownwards to the lower…
Electrical engineering
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