. Locomotive engineering : a practical journal of railway motive power and rolling stock . A STOKY WITHOUT WOltUS. the sight of x, y and :. But as Im notgoing to mention algebra here, no oneneed have hysterics. Tractive power is the pull of the engineon the drawbar in pounds—not per any-thing; just plain i6-ounce pounds, sameas a spring balance. To find this pull, wemust consider the factors which do thepulling. These are: Steam pressure which iseffective in the cylinder, area of piston onwhich it acts, length of the stroke throughwhich it acts and diameter of drivingwheels. The way in which a
. Locomotive engineering : a practical journal of railway motive power and rolling stock . A STOKY WITHOUT WOltUS. the sight of x, y and :. But as Im notgoing to mention algebra here, no oneneed have hysterics. Tractive power is the pull of the engineon the drawbar in pounds—not per any-thing; just plain i6-ounce pounds, sameas a spring balance. To find this pull, wemust consider the factors which do thepulling. These are: Steam pressure which iseffective in the cylinder, area of piston onwhich it acts, length of the stroke throughwhich it acts and diameter of drivingwheels. The way in which all of these actand how the figures cancel each other,was clearly shown in the issue of Novem-ber, 1896. Suffice to say that the usualformula is d y SX Af. E. P. its tractive force ordrawbar pull in starting, at long cut-off,this is the accepted figure. Taking an 18-inch engine, we have 18 X18 = 324 pounds pull for each poundmean effective pressure per inch of strokefor a 1-inch driver. Calling boiler pressure 160 pounds, then85 per cent, of 160 equals 160 X 85 = 136
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