. Transactions. Hoisting Engine, Centre Star. free entrance of a man. Considerable steam is no doubt wasted inthis length of pipe, but it is certainly cheaper than the difficult trans-portation of coal to a separate boiler plant. STEAM PIPES IN BLACK BEAR TUNNEL. In this tunnel two pipes, 8 in. and 6 in. diameter, convey thesteam 3000 ft. from the boiler-house to the Le Roi head works temperature of the steam inside is 480°, but the insulation is sogood that the outside is only warm. To bring this about severallayers of packing were used—first, air cell asbestos covering, with air Mi
. Transactions. Hoisting Engine, Centre Star. free entrance of a man. Considerable steam is no doubt wasted inthis length of pipe, but it is certainly cheaper than the difficult trans-portation of coal to a separate boiler plant. STEAM PIPES IN BLACK BEAR TUNNEL. In this tunnel two pipes, 8 in. and 6 in. diameter, convey thesteam 3000 ft. from the boiler-house to the Le Roi head works temperature of the steam inside is 480°, but the insulation is sogood that the outside is only warm. To bring this about severallayers of packing were used—first, air cell asbestos covering, with air Mining in the Rossland District. 471 cells rnnning lengthwise, then ^in. strips of wood set at right gives an airspace of i/^in. Then same type of covering as first,except that air cells run around the pipe, and finally, a thorough coatof lime whitewash to close the pores. As expansion and contractionamount to considerable in a pipe line like this, siphon joints are in-. Shafl at Surface, Centre Star. serted every 200 feet. These are well packed, and will allow alengthening of 14 in., though only about one-third of that is everused. SURFACE PLANT. A short description of the Centre Star surface plant might beintroduced here. The chief difference between the one at the CentreStar and the one at the Le Roi is that the latter is slightly larger,otherwise they are very similar. As for the War Kagle, most of thesurface work required is done in the Centre Star shops. 472 The Cafiadian Mining Institute. CARPENTER SHOP. To the east of the shaft house is the carpenter shop. This build-ing is equipped with a 40-inch swinging cut-oflF saw, run by a 30 motor placed overhead on the turntable from which the sawhangs. It is arranged to turn by a pinion and gear, and to cut bevelsof any angle so that timbers do not need to be moved. A speed of
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
