. Railway mechanical engineer . The U. S. Standard Heavy Mountain Type Locomotive for the Santa Fe type is equivalent to about 109 per design of the boiler itself is well balanced, both as tothe ratio of tube length to diameter and the ratio of gratearea to heating surface. The latter relation checks almostexactly with Coles assumption of 120 lb. of coal per squarefoot of grate per hour at the maximum boiler output. In the table is presented a comparison of the principal di- Itoiler pressure, lb. per sq. Diameter of drivers, in Kvaporatini^ heiting surface, sq, ft. Superheating
. Railway mechanical engineer . The U. S. Standard Heavy Mountain Type Locomotive for the Santa Fe type is equivalent to about 109 per design of the boiler itself is well balanced, both as tothe ratio of tube length to diameter and the ratio of gratearea to heating surface. The latter relation checks almostexactly with Coles assumption of 120 lb. of coal per squarefoot of grate per hour at the maximum boiler output. In the table is presented a comparison of the principal di- Itoiler pressure, lb. per sq. Diameter of drivers, in Kvaporatini^ heiting surface, sq, ft. Superheating surface, sq, ft Grate area, sq. ft 200 200 185 200 69 69 69 70 4,666 4,790 4,430 3,984 1,085 1,086 882 The tonnage rating charts for the two types were preparedby H. S. Vincent and are similar to those shown in the See the Raihcay Meclianical Engineer for December, 191S, page 649. 25 26 RAILWAY MECHANICAL ENGINEER 93, No. I.
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