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 203
lied to the driving gear, turning it in one di-rection, winds the cables upon the drum and causes the car toascend, and when the power is reversed, the drum turns in theopposite direction, paying out the cables, and causing the car todescend. The weight of the car is balanced by a counterweight,… … Ques. How is the coun-ter balance usually propor-tioned for drum elevators? Ans. It is made heavy-enough to balance the carwith its average load. Ques. Why? Ans. To avoid gravitywork as much as possible. Thus with average load, very-little power is required—justenough to overcome the frictionof the…
Electrical engineering
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