Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 961
able of from If to If in. in diameter, is coiled, the outer end passing from itover the pulley on the top of the derrick, and attached to the drilling tools.When these are to be lowered or withdrawn, it is done by means of powerapplied to the bull-wheel. In localities where the rock is some… … and an inch in thickness; it is driven in sections of 10 ft., and great care is needed that it be not bent or deflected, since it is to guide the drilling tool-. The engine is so placed that its drive- or balance-wheel shall be from 20 to25 ft. from the centre of the derrick, and atone-half this…
Mechanical engineering -- Dictionaries
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