Engineering and Contracting . sing andre-passing. When the powder was broughtin to the heading the were piled onthe side of the tunnel opposite to the lightwires. The exploders which were made upon top were brought in separately and piledseparately from the powder. The nipper whocame in with the exploders stayed near thepowder and exploders until they were takeninto the heading to load up. Before startingto load the light wires were taken back from25 to 30 ft. at least. On top, the powder and exploders werekept in magazines widely separated and nothawing of powder except by a slow warmt
Engineering and Contracting . sing andre-passing. When the powder was broughtin to the heading the were piled onthe side of the tunnel opposite to the lightwires. The exploders which were made upon top were brought in separately and piledseparately from the powder. The nipper whocame in with the exploders stayed near thepowder and exploders until they were takeninto the heading to load up. Before startingto load the light wires were taken back from25 to 30 ft. at least. On top, the powder and exploders werekept in magazines widely separated and nothawing of powder except by a slow warmthwas allowed. When the powder was firstdelivered it was placed in the powder maga-zine, which was always kept at a temperatureof 75 to 85°, and enough cases wgre openedup to provide powder for the next shift whilethe powder already opened would be used forthe present shift. The powder as opened upwas piled loosely on racks provided for thatpurpose. The steam radiator which furnishedheat for the magazine was covered over with. Fig. 4. View of Tunnel Heading After a Shot—Muck Shots Blew Out the Holes Where Men Are Sitting. a screen down to within about 3 of thefloor. The screen had a sharply sloping top,so that no powder could be laid on the radi-ator or on the screen. There was roomenough to sweep out under the screen. Thepowder was ordered well ahead, usually sothat the supply very seldom went below 800lbs. This gave the new lot of powder a chanceto get partially thawed out before the caseswere opened. It had 8 hrs. in which fully tothaw out after it had been opened. Thiswas in extreme cases and as a usual thingthe powder was fully thawed before thecases were opened. All drill steels were made and sharpenedwith a I-eyner drill sharpener, there beingone blacksmith and a helper on the day shiftonly. They handled from 120 to 200 piecesof steel per day and did all general workbesides. In the shop there was acoke forge for heating the drills, a coal forgefor th
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
