. Railroad construction. Theory and practice . ^ the dynamometer of a train will not be that on alevel track at imiform velocity, unless the track is actuallylevel and the velocity really uniform. Dynamometer tests under other circumstances are there-fore of no value unless it is possible to determine the truevelocity at any instant and its rate of change, and also to de-ter^iine the grade, Of course, the grade is easily found, aTd. 20 30 40 50 Velocity in miles per hour ^00 I

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