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 713
1875.—Com-menced in October, I8fiil, run 4 years byhand, size 4^ x C—5,200 ft. Thirteenmonths since the drills were introducedand the size of tunnel increased to 8 x 12.l!un in 13 months, 4,278 ft. Averageweekly progress, 70 ft. Expense by hand-labor, which included pumping, monthly,|34,000 to… … is double, and connects by its upper teeth witha beveled driving-gear, and by its lower teethwith a release gear, which is a frictional gear,and is fitted to the lower end of the feed-shaft,to the top of which a gear is feathered, fittingto the upper gear on the screw-shaft, which hasone or more…
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