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 98
he diameter corresponding to theformula should be used in order to allow for irregularities in winding andfor insulation between the layers. If R is taken at other than 68° F (20° C), a new value of R, i.e., R, must betaken, where R = R (1 -f 0.0022 0/), where 6/ is the rise in temperature above… … For square cores, Fig. 3, d _ |~ ^862500 (a2 - ft2) / + ^1* _ For rectangular cores, Fig. 4, d = |~ /431250 (A - a) (A + B + cTTt>) + ^1* For core made up of square and two semi-circles, Fig. 5, radius of core-circle, b.radius of outer-circle, b. 86 ELECTRO-MAGNETS. d _ I 4/862500 (B — b) [n (B…
Electrical engineering
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