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 122
///, towards the roof, within the limitsof the section. From the heading, enlargements were made at ROCK.WORK AM) TUNNELLING. 97 different places, to get additional working faces. The progressof this work was as follows : Shaft No. i was sunk at an aver-age rate of 52 feet per month. Shaft No. 3 at… … Fig. 36. for 23 months. From the north end the rate was 58.68 feet permonth for 19 months, and 56.80 feet per month for the last 10months. The advance was thus much less at the north end,where the water followed the grade, than at the south end, whereit could run off. The whole distance worked from…
Railroad engineering
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