. American engineer and railroad journal . ometimes empty and fre-quently but partly loaded, it is necessary in order to determinethe cost of the actual work done by some departments totake into account the cars themselves, as well as theircontents. For this and other reasons, it has been customaryto base much of the statistical work upon the car mile as aunit, and to compute the cost of engine service upon theengine mile unit. In order that such statistics of engine service may be com-parative from month to month, and year to year, it is evidentthat the amount of work performed by the locomot
. American engineer and railroad journal . ometimes empty and fre-quently but partly loaded, it is necessary in order to determinethe cost of the actual work done by some departments totake into account the cars themselves, as well as theircontents. For this and other reasons, it has been customaryto base much of the statistical work upon the car mile as aunit, and to compute the cost of engine service upon theengine mile unit. In order that such statistics of engine service may be com-parative from month to month, and year to year, it is evidentthat the amount of work performed by the locomotives foreach mile run must remain reasonably uniform. At some CRANK PIN AND AXLE CALCULATIONS. EJditOT American Engineer: Being very greatly interested and profited by Mr. Francis admiraible articles on the question of fiber stress andthe proper diameters of crank pins, I desire to present, as a Let PBoiler Pna x. area of = Leier arm. 5 = Fiiier ^oment of Resistance. (See tab I elM = Betidinq moment in inctl ■■ FxL. 5 = R or Vs. M or n- 5 ■ and opposite R in table find dDiagram and Formulae for Crank Pins.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
