Cyclopedia di ingegneria locomotiva, con domande di esame e risposte; un manuale pratico sulla cura di costruzione e la gestione delle locomotive moderne. La pressione di rd allora sarà seguente: .666 x 40 = 26.64 libbre, o praticamente il sameas trovato dall'altro metodo. Fig. 118 illustra un tipo di frequentlymet di diagramma con, e uno che richiede un trattamento alquanto differenziato nella stima della potenza sviluppata. Si noti che, a causa del carico leggero e dell'interruzione anticipata, la curva di espansione scende notevolmente al di sotto della linea atmosferica, nonostante il motoredoda cui questa diagra

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Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . rd pressure will then be asfollows: .666 x 40 = 26.64 lbs., or practically the sameas found by the other method. Fig. 118 illustrates a type of diagram frequentlymet with, and one which requires somewhat differenttreatment in estimating the power developed. It willbe noticed that, owing to light load and early cut-off, the expansion curve drops considerably below theatmospheric line, notwithstanding that the enginefrom which this diagram was taken is a non-condens* 254 LOCOMOTIVE ENGINEERING ing engine. When release occurs at R, and the ex-haust side of the piston is exposed to the atmosphere, the pressure immediately rises to a point equal to, orslightly above, that of the atmosphere. Fig. 118 was taken during a series of experimentsmade by the author for the purpose of ascertainingthe friction of shafting and machinery, and the engineit was obtained from is a Buckeye 24x48 in. Theboiler pressure at the time was only 40 lbs., and a No.20 spring was used. The ordinates are drawn accord-. 13 ./cr5r*/z<s*firp Figure 118 ;ng to the method illustrated in Fig. 117. By placingthe rule on points A and B, the distance between thosetwo points is found to be 3^ in., or 58 sixteenths.Dividing this by 10 gives 5.8 sixteenths, or nearly ^in., as the width of the spaces; the two end spacesbeing one-half of this, or T in. wide. The first fiveordinates, counting from A, express forward pressure, represented by the arrows. The remaining five ordi-nates, counting from B, express counter or back THE INDICATOR 255 pressure, represented by the arrows pointing in the opposite direction. Measuring the pressures along I the first five ordinates, and adding them together, gives J63.1 lbs., which divided by 5 gives 12.65 ^s* as ^e mean forward pressure (M. F. P.). Then figuring up the counter pressure in the sameimanner on the other

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectlocomot
• bookyear1916