Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 81
ows the method with sufficient clearness. A heavyyoke of wrought iron has a small hole in one end through which the testrod is pushed, through the exciting coilshown, and against the bottom of theyoke, which is surfaced true and smooth,as is the end of the test rod. In operation, the exciting… … (B = 1,317 X sll + JC- Fig. Where P = pull in pounds as shown onthe balance, A = area of contact of the rodand yoke in square inches. J(Ms found as in the Hopkinson methodpreceding this. Following is a description of a practical adaptation of the permeameter to •shop-work as used in the factory of…
Electrical engineering
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