Home-farm power and lighting, a book of helpful instruction on the installation (1920)
Cincinnati, American automobile digest · leaf 120
SANDPAPER 5 rpjp … Fig. 70. Method of sanding-in new brushes. commutator, but generally they stand at a slightangle, so that the friction between the brush andcommutator tends to increase the pressure be-tween them. The brush is first ground or fileddown on its bearing surface to the approximateangle of contact. Then…
Electricity in agriculture · Electric lighting · Internal combustion engines
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
