. Applied thermodynamics for engineers. LOCOMOTIVE 353 is ird-Lp ^ ttD til is work to be trans-mitted to the point ofcontact between wheeland rail without loss,and that the diameterof the wheel is D feet,then the tractive power,the force exerted atthe rim of the wheel,d-^LpD The value of p, withsuch valve gears as areemployed on locomo-tives, may be taken at80 to 85 per cent of theboiler pressure. Theactual tractive power,and the pull on thedrawbar, are reducedby the friction of themechanism; the latterfrom 5 to 15 per ordinary con-ditions of rail, thewheels will slip whenthe tracti
. Applied thermodynamics for engineers. LOCOMOTIVE 353 is ird-Lp ^ ttD til is work to be trans-mitted to the point ofcontact between wheeland rail without loss,and that the diameterof the wheel is D feet,then the tractive power,the force exerted atthe rim of the wheel,d-^LpD The value of p, withsuch valve gears as areemployed on locomo-tives, may be taken at80 to 85 per cent of theboiler pressure. Theactual tractive power,and the pull on thedrawbar, are reducedby the friction of themechanism; the latterfrom 5 to 15 per ordinary con-ditions of rail, thewheels will slip whenthe tractive power ex-ceeds to thetotal weight carried bythe driving fraction of thetotal weight is calledthe adhesion, and it isuseless to make thetractive power locomotives of cer-tain types, a tractionincreaser is sometimesused. This is a devicefor shifting some of theweight of the machinefrom trailer wheels todriving wheels. Theweight on the driversand the adhesion arethereby increased. Theengineman, upon ap-. 354 APPLIED THERMODYNAMICS proaching a heavy grade, may utilize a higher boiler pressure or a later cut-offthan would otherwise be useful. 510. Compounding. Mallet compounded the two cylinders as early as steam pipe between the cylinders wound through the smoke box, thus becom-ing a reheating receiver. Mallet also proposed the use of a pair of tandem compoundcylinders on each side. The Baldwin type of compound has two cylinders on eachside, the high pressure being above the low pressure. Webb has used two ordinary ■outside cylinders as high-pressure elements, with a very large low-pressure cylinderplaced under the boiler between tlie wheels. In the Cole compound, two outsidelow-pressure cylinders receive steam from two high-pressure inside cylinders. Theformer are connected to crank pins, as in ordinary practice: the latter drive aforward driving axle, involving the use of a crank axle. The four crank effortsdiffer in phase by 90°. T
Size: 1032px × 2422px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913
