Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 976
ar and tear on switch con-tacts, controller contacts, controller magnets, commutator,armature, steel worm, bronze gear or gears, thrust plates,ball bearings, armature bearings, drum-shaft bearings, theear cables, the counterweight cables and the back-drumcables are all materially increased also by…
