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 132
nd 318 feet deep, and is theworking shaft where the material excavated eastward is hoisted. ROCKWORK AND TUNNELLING. 107 The Central Shaft, about midway between the ends of the tun-nel, is elliptical in section, 27 feet in diameter along the line oftheroad, 15 feet in diameter across the road, and… … in the intermediate depression. The general character of therock at the eastern end, and at the central shaft, is mica slate,with quartz ; and at the West Shaft, a hard quartzite. Thefirst 2000 feet at the western end, being through a rapidly decom-posing material, required to be arched with brick.…
Railroad engineering
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