. The car wheel; giving the results of a series of investigations . s at-tained. Take the case of the 36-in. steel-tired wheelon the lOO-lb. rail. An area of .03 sq. in. sustained theinitial load of 500 lbs., with an average pressure of16,666 lbs. per sq. in. By increasing this load to 5,000lbs. the area is increased to .08 sq. in. If this extra4,500 lbs. which was applied be considered as loadeduniformly over the whole area, there would be anaverage increase of pressure of 56,250 lbs. per sq. 56,250+16,666 = 72,916 lbs. per sq. in. on theoriginal .03 sq. in. which carried the initial lo
. The car wheel; giving the results of a series of investigations . s at-tained. Take the case of the 36-in. steel-tired wheelon the lOO-lb. rail. An area of .03 sq. in. sustained theinitial load of 500 lbs., with an average pressure of16,666 lbs. per sq. in. By increasing this load to 5,000lbs. the area is increased to .08 sq. in. If this extra4,500 lbs. which was applied be considered as loadeduniformly over the whole area, there would be anaverage increase of pressure of 56,250 lbs. per sq. 56,250+16,666 = 72,916 lbs. per sq. in. on theoriginal .03 sq. in. which carried the initial load of500 lbs. This assumption runs the load up to anexceedingly high limit, possibly too high, as it givesa pressure of more than 170,000 lbs. per sq. in. at thecenter of the area of contact, with a load of 20,000 considering the results obtained in this investi-gation, it must be borne in mind that the areas ofcontact were all obtained under static loads. Run-ning conditions must necessarily be more severeand impose higher stresses. In an investigation 91.
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