Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States (1883)
Vose, George L. (George Leonard), 1831-1910 · Boston : Lee and Shepard · leaf 133
arched with brick. The headingshave been driven, and much of the enlarging done, by the ma-chine known as the Burleiirh Rock Drill. These drills are in io8 MANUAL FOR RAILROAD ENGINEERS. each heading mounted upon two carriages, standing side by side,with a space of about 6 feet between them. Each… … be fired these carriages are run back out of the way. The powerfor working the drills is the same as that used at the Mont CenisTunnel, viz., compressed air. At the eastern end of the work adam across the Deerfield River gives a head of 21 feet, whichworks four turbine wheels, each wheel working…
Railroad engineering
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