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 1209
Similarly in a multi-polar armature, our spacingmust be such that only every other conductor is connected 1180 Steam Engineering to a commutator segment. The front and rear spacingsmust therefore differ by 2. That the front and back spacings must be odd can beeasily determined with the scheme… … With a lap-wound armature there are as many pathsthrough the armature, and as many brushes as there arepoles. This can be seen from the development of -Fig. 524,the paths through the armature being i-2-15-h-18-13-g i-17-4-a-l-6-b e-12-7-d-10-5-c e-9-14-f-ll-16-gThese paths are unequal in length, as…
