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 1192
^ Kj Kj Fig. 515 In the figure the full lines denote the active conductors^and the dotted lines the inactive conductors on the insideof the armature ring. The small squares at the top repre-sent the commutator segments, and the shaded cross sectionsthe pole pieces. The arrows indicate the direction…
