Transactions . Fig. -Plugger Drills in Operation* at Grand Central Terminal, New York. was invented and its application to general mining work has been veryrapid. Thousands of them are in use. Fig. 9 is a sectional view and shows a stoper in operation. In this particular case a jet discharges aspray of water for allaying the dust. ROCK-DRILLING ECONOMICS. 161 Specifications of Stoper Drill. Piston diameter, inches 2 Piston stroke, inches 4 Length of feed, inches 22 Length of machine over all (closed), inches 52J^ Length of machine over all (extended), inches 743^ Weight, pounds 73 Size
Transactions . Fig. -Plugger Drills in Operation* at Grand Central Terminal, New York. was invented and its application to general mining work has been veryrapid. Thousands of them are in use. Fig. 9 is a sectional view and shows a stoper in operation. In this particular case a jet discharges aspray of water for allaying the dust. ROCK-DRILLING ECONOMICS. 161 Specifications of Stoper Drill. Piston diameter, inches 2 Piston stroke, inches 4 Length of feed, inches 22 Length of machine over all (closed), inches 52J^ Length of machine over all (extended), inches 743^ Weight, pounds 73 Size air hose, inch M. Fig. 6.—View of Jackhamer. 4. The Water Leyner Drill. The water Leyner drill is shown in section in Fig. 11. Fig. 12 is a photo-graphic view of a drill of the Leyner type driving an inclined raise in shaft, Osceola Amygdaloidal lode of the Calumet and Hecla mine. Thismachine was in actual operation when the picture was taken. VOL. XLVII.—6 162 ROCK-DRILLING ECONOMICS. Specifications of Water Leyner Drill. Weight, drill only, 24-in. feed (standard), pounds 150 Length over all, 24-in. feed (standard), inches 47% Weight, drill only, 30-in. feed (special), pounds 160 Length over all, 30-in. feed (special), inches 53% Bore of cylinder, inches 2J^ Length of stroke of hammer, inches 3 Size of air inlet, inches M Size of water inlet, inches Yl Standard hollow round drill steel and shank, inches 134 Most economical depth to which holes can be drilled, feet 8 to 12 Air Consumption. 60 lb. 70 lb. 80 lb. 90 lb. 100 lb. 64 cu. ft. 75 cu. ft. 87 cu. ft. 98 cu. ft. 109 cu. ft. Records of R
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
