. American engineer and railroad journal . Card*23 Miles Per 11 ur 0 Rev. Per Mm. 30 <f of Total Work Pressure Lbs. 130lua. of Cylinder 32 HG. 4. INDICATOB CAEDS FBOM MELLIN COMPOUND, 4—6—0 TYPE FREIGHT ENGINE—C. C. C. & ST. L. B. B. the result can only be approximate, the closeness of the ap-proximation may be judged from the indicator cards shownin Fig. 4, which were chosen at random from a set takenfrom engine number 350 on the Big Four in 1897. Thecards taken during this test show a maximum variation of. FIG. 6.—LOW-PRESSURE PISTON AND CYLINDEB HEADS. about 4 per cent, either
. American engineer and railroad journal . Card*23 Miles Per 11 ur 0 Rev. Per Mm. 30 <f of Total Work Pressure Lbs. 130lua. of Cylinder 32 HG. 4. INDICATOB CAEDS FBOM MELLIN COMPOUND, 4—6—0 TYPE FREIGHT ENGINE—C. C. C. & ST. L. B. B. the result can only be approximate, the closeness of the ap-proximation may be judged from the indicator cards shownin Fig. 4, which were chosen at random from a set takenfrom engine number 350 on the Big Four in 1897. Thecards taken during this test show a maximum variation of. FIG. 6.—LOW-PRESSURE PISTON AND CYLINDEB HEADS. about 4 per cent, either way from exact equalization, both enough, since we may get a difference of 25 per cent, in ain simple and compound position. That may be called near simple engine, by mere variation in lubrication! In general. April, 1906. AMERICAN ENGINEER AND RAILROAD JOURNAL. 133 less attention is given to equalizing the work in the simpleposition than in the compound, since this is an abnormalcondition, as is conveyed by the word emergency—appliedto the sirnpling valve. The experience o£ builders and users of compound engineshas taught them that for the present at least the engineermust be prevented from using the sirnpling valve unneces-sarily, by some other means than persuasion. He soon findsthat, under certain conditions, the opening of the three-waycock has the same result as of another engine pushing frombehind, and in his laudable zeal to get over the road, hishand seeks the little brass lever too often for the go
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
