. Electric railway journal . charges into a divided chute whichdrops the sand down into the front ends of the two rotarydrying drums which are mounted on the basement floor, 20 the floor of the wet sand bin. The drier room is46 ft. x 34 ft., and provides space for the steam-heating plantboiler in addition to the two drier drums and furnaces. Theheating boiler and drier furnaces are designed to burn anthra-cite pea coal and storage space for 165 tons is provided in 754 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVII. No. 17. two vaults under the sidewalk of Fifty-fourth Street. Ashesare removed
. Electric railway journal . charges into a divided chute whichdrops the sand down into the front ends of the two rotarydrying drums which are mounted on the basement floor, 20 the floor of the wet sand bin. The drier room is46 ft. x 34 ft., and provides space for the steam-heating plantboiler in addition to the two drier drums and furnaces. Theheating boiler and drier furnaces are designed to burn anthra-cite pea coal and storage space for 165 tons is provided in 754 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVII. No. 17. two vaults under the sidewalk of Fifty-fourth Street. Ashesare removed in cans which are hoisted on a hand elevatorthrough a shaft opening onto the sidewalk. The sand driers, which were furnished by the AmericanProcess Company, consist of a furnace for burning the coaland sheet-iron cylinder into which the hot gases from thefurnace discharge under forced drafts. The drying drumor cylinder is 25 ft. long and 42 in. in diameter. On theinterior are riveted a number of iron shelves which catch the. Metropolitan Street Railway—Wet Sand Storage Bin sand at the bottom of the drum, lift it as the drum rotates anddrop it at the top so that it falls through the blast of hotfurnace gases. The drum rotates on two steel tires which reston a pair of rollers driven through bevel gearing from th-main countershaft suspended from the ceiling of the furnaceroom. It has a slope of 7 in. from the furnace end to thedry sand end and the wet sand hopper discharges into theupper end. As the drum rotates the sand is continuouslyraised and dropped through the hot gases, and the slope ofthe drum is sufficient to cause the sand to work its wayslowly out to the discharge end. The rate of drying is regu-lated by varying the volume of hot gases sent through thedrum by the blast fan. This fan is mounted under the ceilin;;of the furnace room and is belt driven from the main counter-shaft. The blast is controlled by slide dampers in the pipesleading to each furnace. Either drum
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