. American engineer . From the percentages given in the last line of the table, it isevident that the mated cast iron wheels gave a much higherfrictional resistance than the mated cast steel wheels. It wasexpected that there would be a difference in the frictional re-sistance of cast steel and cast iron wheels, but such a largedifference was not anticipated, and the problem of assigning areason for this great difference became more difficult when itwas found that the mated cast iron wheels with good contoursgave a higher frictional resistance than did two sets of non- Tart. 3 Fig. 11—Ave
. American engineer . From the percentages given in the last line of the table, it isevident that the mated cast iron wheels gave a much higherfrictional resistance than the mated cast steel wheels. It wasexpected that there would be a difference in the frictional re-sistance of cast steel and cast iron wheels, but such a largedifference was not anticipated, and the problem of assigning areason for this great difference became more difficult when itwas found that the mated cast iron wheels with good contoursgave a higher frictional resistance than did two sets of non- Tart. 3 Fig. 11—Average Resistance of Sets A and C /2° Different Tract<s- Fig. 10—Set J; Slightly Non-matedDavis Cast Steel Wheels. ally increases up to 6 deg. curvature, and from that point to12 the slope was more pronounced. The lower line inFig. 11 appears as such in all the succeeding diagrams. Set A. Line 2 in Fig. 11 was plotted from the average re-sistance obtained when the mated cast iron wheels, designated mated wheels with contours not so good. this time, andwith the data at hand, no satisfactory e-xplanation can be givenfor the action of the mated cast iron wheels. Another interesting feature is shown by the dotted line 3 inFig. 11. In conducting the work, a series of tests was madewith wheels 1 and 2 leading, and another series with 3 and 4leading. Reference to Table 1 will show that wheels 3 and 4were larger in circumference than were wheels 1 and 2. Itwas found that the average resistance in pounds per ton for 500 RAILWAY AGE GAZETTE, MECHANICAL EDITION
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
