Chicago : Engineering and Contracting Pub. Co. · leaf 49
120 4 2 X12 X 5 0 48 16 3 X12 X 9 0 4S0 1 2 X12 X50 0 100 7 3 X12 X 5 9 126 2 8 X 8 X T 0 S5y3 2 8 X12 X12 0 192 1 8 X S X10 10 64 Total bd. ft 2,373% The steel needed for an underground orebin of the size specified is: Iron plate, 24 in.X 7 ft. X Vl in. = 142.8 lbs., iron chute (totalarea) 4 ft. X… … Fig. 3—Blasting in Shaft Sinking. fur an underground ore Inn i» I ll>^ powderper ton, or 501 lbs.; fuse, I tt pet ton, or 504ft.! caps, 1.1 per ton, or 177 CAM The station, which is to he I I ft long, willneed 24 holes in the face, each 8 ft. deep, inorder to make an advance of 2 ft. per…
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