Mechanical movements, powers, devices and appliances; (1903)
Hiscox, Gardner Dexter, 1822?-1908 · New York, The N.W. Henley & co. · leaf 34
41. CHINESE SHAFT DERRICK.—The sheaves suspended from the upper part of thederrick legs allows the bucket to be raisedabove the mouth of the shaft or pit by thedifferential windlass. 42. COMPOUND WEIGHT MOTOR, iola limited fall. The power is only equal to one-half of one of the weights. The time of…
Mechanical movements
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