International Library of Technology · Scranton, International Textbook Co. · leaf 423
he resistance of the armature can be deter-mined quite closely, since the length of wire on it can beestimated and the cross-section is already known. Thelength of wire can be obtained by laying out one of thecoils to scale and measuring up the mean length of a turn.The coil has to bridge over the… … Fig. 1623. portion of the coil will be made 15 in. long, in order to allowthe coil to project about f in. from the slots at each endbefore it begins to turn. The mean turn, shown dotted, isthe turn through the center of the coil. Its length is readilydetermined from the drawing, and in this case it…
Electrical engineering
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