Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 213
springscalled bumpers, or on oil bumpers, so as to relieve the tension on thehoisting cables. These bumpers interpose a yielding resistance to thecar when settling to rest and thus often prevent severe shocks or jars.Below the lowest landing it is well to have the shaft constructed airtight as far… … oino ooo oocvjfvo m- in <n ooo — ~ CM I ooo > ooo r> -t in co SPEED OF CAR IN FEET PER MINUTE Fig. 4,130.—Elevator motor horse power diagram. Three factors determine the horse powerof the motor that should be used, namely, the weight to be hoisted, the speed of traveland the efficiency of…
Electrical engineering
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