Pacific service magazine . Top center heading method. Air shovel and cars employed for mucking. Used in solid or tight formations Tunnel mucker used in the work muckers at the bench under a second shiftboss. Since the most continuous and theheaviest work was performed by themuckers of the bench, and since the speedwith which the bench could be mucked wasthe limiting element in our tunnel prog-ress, we were most desirous of replacingthese muckers with a mechanical ordinary steam shovel using com-pressed air instead of steam as source ofpower was unsuitable on account of thelarge e
Pacific service magazine . Top center heading method. Air shovel and cars employed for mucking. Used in solid or tight formations Tunnel mucker used in the work muckers at the bench under a second shiftboss. Since the most continuous and theheaviest work was performed by themuckers of the bench, and since the speedwith which the bench could be mucked wasthe limiting element in our tunnel prog-ress, we were most desirous of replacingthese muckers with a mechanical ordinary steam shovel using com-pressed air instead of steam as source ofpower was unsuitable on account of thelarge expense of the crew and trackmen re-quired for operation and the working spacesuch a large shovel would occupy. At this time there was developed by oneof the steam shovel companies an airoperated shovel of the full swing or merry-go-round type, mounted on crawlers or «caterpillars. This shovel, with boiler and afuel tank replaced by cast iron counter-weights mounted on the rear of the frame,had the advantage of extreme com
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Keywords: ., bookcentury1900, bookdecade1910, bookidpacificservi, bookyear1912
