792 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE XWl— Continued 



B. &s. 



Gage 



No. 26 

 No. 26 

 No. 26 

 No. 26 

 No. 26 

 No. 26 



No. 28 

 No. 28 

 No. 28 

 No. 28 



No. 28 

 No. 28 



No. 30 

 No. 30 

 No. 30 

 No. 30 

 No. 30 

 No. 30 



No. 32 

 No. 32 

 No. 32 

 No. 32 

 No. 32 

 No. 32 



No. 34 

 No. 34 

 No. 34 



No. 34 

 No. 34 

 No. 34 



No. 36 

 No. 36 

 No. 36 

 No. 36 

 No. 36 

 No. 36 



Temper, 



B. &S. 



Numbers 



Hard 







2 

 4 

 6 

 8 

 10 





 2 

 4 

 6 

 8 

 10 







2 

 4 

 6 

 8 

 10 







2 

 4 

 6 

 8 

 10 





 2 

 4 

 6 

 8 

 10 





 2 

 4 

 6 

 8 

 10 



Thickness, 



0.0174 

 0.0176 

 0.0178 

 0.0166 

 0.0173 

 0.0168 



0.0130 

 0.0129 

 0.0137 

 0.0128 

 0.0150 

 0.0138 



0.0110 

 0.0110 

 0.0111 

 0.0109 

 0.0115 

 0.0114 



0.0086 

 0.0077 

 0.0087 

 0.0090 

 0.0088 

 0.0088 



0.0063 

 0.0063 

 0.0061 

 0.0063 

 0.0064 

 0.0066 



0.0054 

 0.0054 

 0.0049 

 0.0053 

 0.0054 

 0.0059 



Actual 

 Percentage 

 Reduction 

 by Rolling 







22.6 

 32.9 

 49.9 

 60.1 

 65.7 







23.2 

 40.1 

 52.9 

 55.6 

 66.4 







17.6 

 34.2 

 53.0 

 58.8 

 66.7 





 28.6 

 28.6 

 47.6 

 61.3 

 67.0 





 24.0 

 41.9 

 44.5 

 63.4 

 70.0 







16.1 

 35.4 

 52.4 

 58.0 

 68.3 



Tensile 



Strength, 



lb. per 



sq. in. 



54,300 



73,600 



86,800 



108,500 



116,600 



115,700 



57,500 



73,400 



91,500 



105,300 



107,000 



117,600 



55,400 



72,400 



86,500 



102,200 



101,900 



111,000 



58,200 

 89,000 

 91,400 

 97,200 

 108,200 

 115,300 



63,900 



81,900 



99,100 



111,300 



110,200 



118,800 



61,300 



77,900 



97,900 



103,000 



114,800 



110,500 



Elonga- 

 tion in 

 2 in., 

 per cent 



69.0 



38.0 



15.0 



4.0 



2.0 



2.0 



58.0 



30.0 



11.0 



4.0 



3.0 



1.0 



61.0 



27.5 



12.5 



2.5 



1.0 



1.5 



52.0 

 8.0 

 9.0 

 3.0 

 1.5 

 1.5 



50.0 

 17.5 

 7.0 

 2.5 

 1.5 

 1.0 



51.0 

 25.0 

 4.5 

 4.0 

 1.5 

 1.5 



Rockwell Hardness, 



'B" Scale, Ji^-in. Ball 



(Red Figures) 



100-kg. 

 Load 



57.3 

 81.5 

 89.2 

 96.1 

 97.3 

 97.7 



61.6 

 82.4 

 90.8 

 95.1 

 95.1 

 99.0 



65.3 

 85.2 

 90.3 

 94.5 

 96.1 

 98.3 



150-kg. 

 Load 



25.0 

 52.6 

 65.9 

 76.3 



78.7 

 80.3 



26.5 

 46.4 

 66.1 

 69.6 

 74.1 

 81.1 



43.1 

 50.3 

 54.2 

 63.1 

 69.7 

 74.4 



Note. — Tensile strength and percentage elongation are an average of 3 specimens 

 in each case; Rockwell hardness values are an average of 15 determinations of 5 

 readings on each of the 3 tension test specimens. 



