International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 359
atthe same time. The cut is fired first (see Fig. 439), followed 948 RAILROAD CONSTRUCTION. by the side rounds, Avhich are fired either single, i. e., onerow on each side of the cut (see Figs. 440 and 441), ordouble fired, i. e., both rows fired simultaneously, as shownin Fig. 442. 1512. Enlarging… … Fig. 444. Fig. 445. drilled at an angle of about 00° with the center line denotedby the letters C. L., as shown in section in Fig. 443 andplan in Fig. 444. 1513- Removing the Bench.—The bench is takenout in two sections, B and i>, as shown in section in Fig.445. The full tunnel section is shown…
Railroad engineering
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