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 1096
thebrush down on the sandpaper, 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… … 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,…
