Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1065
d, andthe more turns of wire we arrange to cut those lines of forceper second the greater will be the E. M. F. Instead of pro-viding more wire or increasing the speed of the armaturewe can increase the magnetism, or number of lines of force,by sending more current through the fields, that is… … Fig. 428use of collecting or slip rings D ^A.B
