. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . inder during one revolution of 7T driver is = 2 X (d: — L X P), where 4d = diameter of cylinder in inches, L = March. 1915. RAILWAY AND LOCOMOTIVE ENGINEERING 77 length of stroke in inches. But there aretwo cylinders in the locomotive, hence thewhole work done by the steam during thistime is = d: i L P. Now, while thedriving wheel makes one revolution, thecenter of the axle, if there is no slip,moves forward a distance ■ D, and thework done is = D T. Equating thesetwo values of the work done
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . inder during one revolution of 7T driver is = 2 X (d: — L X P), where 4d = diameter of cylinder in inches, L = March. 1915. RAILWAY AND LOCOMOTIVE ENGINEERING 77 length of stroke in inches. But there aretwo cylinders in the locomotive, hence thewhole work done by the steam during thistime is = d: i L P. Now, while thedriving wheel makes one revolution, thecenter of the axle, if there is no slip,moves forward a distance ■ D, and thework done is = D T. Equating thesetwo values of the work done wc obtain dJ T L P = 7T T D d2 L X P therefore T = ■ D Considering Compound Locomotives:To calculate the tractive effort of com-pound locomotives the following condi-tions are taken: d = diameter of low pressure cylinder. T = tractive effort. D = diameter of drivers. p = boiler pressure. s = stroke of T X D Then d = , from which T, P X s Shipping Air Brake Parts. By F. W. Bentley, Jr., MissouriValley, air brake department in connectionwith a division shop of any moderate size. FIG. I. the tractive effort can be easily general, the low pressure cylinder di-ameter is made l!/2 times the diameterof a simple locomotive of equal power,the steam pressure being increased 10 percent. Force of Adhesion: In order to utilizefully the tractive effort sufficient adhesiveweight must be provided. It is, therefore,necessary to know the value f the coeffi-cient of adhesion. This varies betweenVi to 1/10, but in general it is takend:LP W as %. We now have = — = R. D 4 W in general will be the weight on driv-ing wheels only. It is evident that thegreater the weight on drivers the less thechance of slipping. It follows then thata locomotive having 400,000 pounds totalweight on driver cannot exceed a pull = 100,000 pounds, except under 4very favorable conditions. If R, the re-sistance of the train, exceeds this , a helping engine must be used.
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