. The Street railway journal . center line of the bunkers and immediately underthe roof carry traveling trolley cranes of special design whichrun the full length of the boiler room and at one end projectout through a door several feet beyond the wall of the build-ing. Coal is hauled to the plant in wagons provided withbeds of special design, as shown in the drawings on the op-posite page. The wagon is run over a pair of scales immedi-ately under the projecting I-beams. After being weighed acrane on one of the I-beams overhead lifts the bed containingthe coal from the wagon by means of the chai
. The Street railway journal . center line of the bunkers and immediately underthe roof carry traveling trolley cranes of special design whichrun the full length of the boiler room and at one end projectout through a door several feet beyond the wall of the build-ing. Coal is hauled to the plant in wagons provided withbeds of special design, as shown in the drawings on the op-posite page. The wagon is run over a pair of scales immedi-ately under the projecting I-beams. After being weighed acrane on one of the I-beams overhead lifts the bed containingthe coal from the wagon by means of the chains attached tothe hinged doors forming the bottom of the bed, and carriesit into the building and over the bunkers. When in a positionto be dumped, heavy hooks attached to the crane are spreadand engage m the iron braces riveted to the sides of the bed,so that when the crane is lowered the weight is taken off thebed and the bottom is allowed to swing open. The two cranestraveling on the separate I-beams work independently. One. : mi- A WAGON BED LOADED WITH COAL BEING ELEVATED BYTHE CRANE pumps, two steam-driven pumps and two heaters in each halfof the station may be operated independently of the set in theother half, and each set of rotary, steam pump and heater mayalso be used separately. This gives four independent sets ofpumps for feeding the boilers. Failure of the feed supply ismade a more remote possibility by the fact that three methodsof feeding may be employed. The usual method is to pump July 28, 1906.] STREET RAILWAY JOURNAL. 129 the feed water by means of the motor-driven Lawrence cen-trifugal pumps from the hot wells into the Hoppes heatersplaced overhead in the pump room. The hot wells are con-nected by i8-in. pipes to the tunnel under the operating roominto which the condensers discharge. The double-acting,steam-driven Prescott outside-packed feed pumps draw thewater from the heaters and force it into 4-in. mains whichrun the full length of the boilerrooms and f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
