Chicago : Engineering and Contracting Pub. Co. · leaf 50
ENGINEERING & CONTRACTING or 47s ft. per hr., and because there are 72 ft. 30.4 72 7 hrs., and there will be = 12.45 rounds. in each round it will take = 7+ hrs., 2.44 2X4% In all it will take about 12 shifts to make and with two men laboring per round, this this cross-cut, with 537.84 lbs. of… … Fig. 4—Plan of Station. and use up 7 X 57.6 = 403.2 lbs. of 40-per centdynamite. An estimate of the labor required is as fol-lows : 10 X 10 X 14= 1,400 cu. ft. of material1,400 broken, or =113 tons broken for the 12.4 station. 113 tons X 21.5 = 2,430 cu. ft. ofloose rock, or 90 cu. vds., which will…
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