Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 970
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, thecar cables, the counterweight cables .and the back-drumcables are all materially increased also by… … Fig. 3S7 DOUBLE WORM AND GEAR ELECTRIC ELEVATOR, OVERHEAD INSTAL-LATION 942 Steam Engineering pq 1 u (0 > SS^gggggiS^ 220V. lOiOiO^-^-0(M(NC4lO -punoj anbjox OOoOOOOOlOiOTHi-lr-HCMCMCOCOC000CO d < bec t > > CM THrHrHr-lrH ft s. bo . .S S -c 1 > o g b- t- t- lO lO t- <N CJ…
