. American engineer and railroad journal . kersfield and Fresno. All the engines of the SanFrancisco & San Joaquin Valley are being fitted up to burnoil and also the engines of the Santa Fe & Pacific running be-tween Mojave and the Needles. It is expected that nothingbut oil will be burned on locomotives of the lines of this com-pany in California at the end of the present year. 346 AMERICAN ENGINEER AND RAILROAD JOURNAL. LARGE LOCOMOTIVE FIREBOXES. Their Influence on Combustion. By A. Bement. The most favorable size of locomotive fireboxes or, in otherwords, the proper amount of grate area, i
. American engineer and railroad journal . kersfield and Fresno. All the engines of the SanFrancisco & San Joaquin Valley are being fitted up to burnoil and also the engines of the Santa Fe & Pacific running be-tween Mojave and the Needles. It is expected that nothingbut oil will be burned on locomotives of the lines of this com-pany in California at the end of the present year. 346 AMERICAN ENGINEER AND RAILROAD JOURNAL. LARGE LOCOMOTIVE FIREBOXES. Their Influence on Combustion. By A. Bement. The most favorable size of locomotive fireboxes or, in otherwords, the proper amount of grate area, is a question which hasforced itself before the motive power departments, especiallyof those roads using bituminous coal; and without doubt isthe most important problem now before these oflicials. When the fact is noted that in general practice grate sur-face has remained at about the same area for several years,while all other features of locomotives have increased enor-mously, the question is raised whether former grates were too. Degrees r in remnerari/re af eseafing gasuFie. 1. large or present ones are too small. As illustrating this matterI compare an engine of ten years ago, which is designated asNo. 1, and another of more recent date, as No. 2: No. 1. No. 2. Cylinders 23x32 Grate surface, square feet 33 Heating surface, square feet 1,900 3,222 Weight on drivers, in pounds 208,000 Here is a case of one engine twice as large as the other withalmost no difference in grate area. It may be assumed that WD Cutric feet of air perptiinif of coalZOO 300 400 SOO 600 700 800 0 S -— -- , ^ ^ \ , V / IS / / ne: Fig. 2. the draft-producing action of the exhaust is the same in bothcases. This being true, it necessarily follows that the grate ofNo. 1 is too large or that of No. 2 too small. The best, mostdirect and least expensive way to determine this is by properanalysis of the gases and study of the combustion process, butthere is other evidence at hand serving
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