Canadian foundryman (1917) . ably that causedby the sudden rise in the temperature ofthe tread of the wheel from brake shoeapplication on descending grades. If weassume that trains are now operated atdouble the velocity they were forty yearsago and the load on the wheels five timesas great, there will be ten times the heatgenerated per unit of time on the treadof the present wheel, as compared tothe wheel under the ten-ton car. Alsothe flange thrust being from five to tentimes greater indicates that we have tentimes the force to contend with that weformerly had. Chilled Car Wheel Manufacturers
Canadian foundryman (1917) . ably that causedby the sudden rise in the temperature ofthe tread of the wheel from brake shoeapplication on descending grades. If weassume that trains are now operated atdouble the velocity they were forty yearsago and the load on the wheels five timesas great, there will be ten times the heatgenerated per unit of time on the treadof the present wheel, as compared tothe wheel under the ten-ton car. Alsothe flange thrust being from five to tentimes greater indicates that we have tentimes the force to contend with that weformerly had. Chilled Car Wheel Manufacturers Re-commendations The information obtained wouldindicate that in order to design nwheel that will fit a given condition ofservice, it requires a thorough under-standing of the intensity of the stressin each part of the wheel and the rela-tion of the stresses to service conditionsOur association believes that due to theseneral conditions confronting; us to-day, and considering the safety factoroperation, that three designs of. FIG. 10 WHEEL OF 850 LBS. PROPOSED THE FOR ALL CARS OF 60 TO 70 TONS CAPACITY. new material and the profit of the manu-facturer. Special wheels are purchasedby many railroads at a higher differen-tial than $10 per ton, and some foun-dries loeeted in remote parts of th?? tiO CANADIAN FOUNDRY M A N ?country far from the raw materials, SUcLas coke and pig iron, must receive alusher price. The profil on a chillediron wheel is so low that a fifteen centfreight rate will often absorb the profilon the wheel. Contracts with railways provide foian equal exchange of tonnage of oldwheels, and it is not necessary to exchange the identical worn out wheels tothe manufacturer. Any chilled ironwheel, no matter where or by whommade, is accepted in pan payment forthe new wheels, and wheels made in Can-ada may find their way into the exchangemarket of Texas, and wheels made inCalifornia are exchanged in Massa-chusetts or vice versa, and as there arefifty found
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