Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 477
ts construction, thereby 58 ELECTRICITY FOR ENGINEERS lowering the mechanical friction of the brushes on thecommutator; they do not cut a commutator so muchby sparking; the commutator has a longer life, thewear being more evenly distributed. Carbon brushes, due to their rather high resistance,will… … FIGURE 30. bon brush will be found which is very hard. As a rulesuch a brush should be thrown away, as it will heatabnormally and at the same time wear the commu-tator. In Fig. 31 we have one of the various so-called oldstyles of leaf brush-holders. The end-on brushes aremore generally used in…
