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 1095
stant changing of the po-sition of the brushes and commutator. AMiatever style of brush is used, the commutator shouldbe kept clean and allowed to polish or glaze itself whilerunning. Xo oil is necessary unless the brushes cut, andthen only at the point of cutting. A cloth (not cottoDwaste)… … ^/ / Fig. 452 smoothed with sandpaper, never using emery cloth, becauseemery is a conductor of electricitj^, and the particles ofemery are liable to lodge themselves between the commuta-tor bars in the mica and short circuit the two bars, therebyburning a small hole w^herever such a particle of…
