Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1215
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…
