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 1090
andpaper, it is an easy matter to movethe sandpaper to and fro and thoroughly clean off theglazed and dirty surface from the carbon, leaving it with aconcave *that will exactly fit the commutator. The advantages of carbon brushes are many. Among thecardinal points are: The armature may run in… … Fig. 453 of the brushes on the commutator; they do not cut a com-mutator so much by sparking; the commutator has a longerlife, the wear being more evenly distributed. Carbon brushes, due to their rather high resistance, willoften heat up considerably, but, although this heat is ob-jectionable,…
