. Railway master mechanic [microform] . *7$~ H 3 x 30000000 x 3625 PtAT£N94 Type 4-4-2. BALDW/M LOC. WORKS. 412 19,600 lbs. per sq. inch. (b) Side bending. Compression increased by steam pressure on other side: 350 lbs. per sq. in. compression. 200 lbs. per sq. inch, steam on other side. 550 lbs. per sq. in. equal 308,000 pounds total pressure. lbs. — moment arm. 308,000 x = inch lbs. = Bending 1650 = Moment of rupture through section of smoke boxand frames. 4,390 lbs. per sq. in. = Fiber stress. Third. Effect of rounding- curves. The centrifugal force of the w
. Railway master mechanic [microform] . *7$~ H 3 x 30000000 x 3625 PtAT£N94 Type 4-4-2. BALDW/M LOC. WORKS. 412 19,600 lbs. per sq. inch. (b) Side bending. Compression increased by steam pressure on other side: 350 lbs. per sq. in. compression. 200 lbs. per sq. inch, steam on other side. 550 lbs. per sq. in. equal 308,000 pounds total pressure. lbs. — moment arm. 308,000 x = inch lbs. = Bending 1650 = Moment of rupture through section of smoke boxand frames. 4,390 lbs. per sq. in. = Fiber stress. Third. Effect of rounding- curves. The centrifugal force of the weight carried by the frontdrivers: 16 degree curve = 358 radius. Speed 30 M. P. H. = 44 feet per second. Weight on journals = 41, 41,000 x442 P = = =6,888 pounds. gv Moment arm=cen-ter of pedestal tofirst bolt in cylinderconnection = moment ==6888 x = 260,-000 inch lbs. Moment of rup-ture = Fiber stress=7,960lbs. per sq. in. From the abovecalculations the fol-lowing conclusionsmay be drawn: First. The inertiaof the boiler follow-ing- the sudden ap-plication of brakescan not produce asufficient force tobreak the frame. Second. The iner-tia of the boiler dueto the accelerationof the train by act-ing with other forcessuch as those pro-duced by water inthe cylinders, maybring about frac- I lire. Third. The dyna-mic effect of thecompression of waterin the cylinders isthe only forc
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