Transactions . e topof each cylinder, are easily actuated together by a drum is partly conical, having three dead coils and six work-ing coils on a cone rising from 12 feet 8 inches to 13 feet 2 inchesin diameter; four coils range from 13 feet 2 inches to 19 feet indiameter; and the remainder run on the parallel drum, 19 feetin diameter. Each engine-house is fitted with an overheadtravelling crane. 160 THE SINKING OF BENTLEY COLLIERY. The sinkiug-eiigiiie at No. 2 pit consisted fo two steamcylinders, 24 inches in diameter and 4 feet stroke, with aparallel drum, 8 feet in diamete
Transactions . e topof each cylinder, are easily actuated together by a drum is partly conical, having three dead coils and six work-ing coils on a cone rising from 12 feet 8 inches to 13 feet 2 inchesin diameter; four coils range from 13 feet 2 inches to 19 feet indiameter; and the remainder run on the parallel drum, 19 feetin diameter. Each engine-house is fitted with an overheadtravelling crane. 160 THE SINKING OF BENTLEY COLLIERY. The sinkiug-eiigiiie at No. 2 pit consisted fo two steamcylinders, 24 inches in diameter and 4 feet stroke, with aparallel drum, 8 feet in diameter, working with steam reducedto a pressure of 60 pounds per square inch through a reducingvalve. As soon as the Coal-measures were reached, the windingengine was used for sinking, and the temporary sinking enginewas removed to No. 1 pit. Power-house.—The power-house, fitted with an overheadtravelling crane, contains one Davey-Paxman compound high-speed generating set of 100 kilowatts; one Scott-Mountain high-. Fig. 14.—Brick-pillars at No. 1 Pit, after Sinking through Quicksand. speed set of 250 kilowatts; and two Eateau low-pressure turbine-generators, with barometric jet and spirojector condensers of 500kilowatts. The four sets generate three-phase alternating cur-rent at a pressure of 550 volts. The switchboard consists of four generating panels, andfeeder and lighting panels. The current for lighting is trans-formed from 550 volts three-phase to 220 volts single-phase byWestinghouse static transformers with a Scott connection, placedbehind the switchboard. Condenser-water is pumped to the top of a Balcke tower,,capable of cooling 92,000 gallons per hour. THE SINKING OF BEXTLEY COLLIERY. 161 Boilirs.—Four Lancashire boilers, working at a pressure of160 pounds per square inch, are each 30 feet long, 9A feet ininternal diameter at the back end, with flues 3 feet 9 inches indiameter. The shell consists of four plates, and the fronts aredished inwards and are supported fro
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1887
