IO 



Uniform Stress and Permanent Strain. 



Test of one st>ecime?i taken fro??i the same bar as the above. Duration 

 of stress 20 minutes. 



Value of ^ = '275. 



No. of 



Initial 



Final 



Permanent 



Stress on 



Value 



Specm. 



Area. 



Area. 



Strain. 



Reduced Section. 



ofC. 





sq. in. 



sq. in. 





Tons. 





R. 1. 



7667 























739O 



•0387O 



16604 



40"6o6 







729O 



•05460 



18-230 



40-55 6 







7i55' 



•O7705 



2COI4 



40*502 







•6954 



•II25O 



21-944 



40-OI5 



Test of one specimen taken from the same bar as the above. 

 Duration of stress 15 minutes. 



£ = •265. 



No. of 



Initial 



Final 



Permanent 



Stress on 



Value 



Specm. 



Area. 



Area. 



Strain. 



Reduced Section. 



ofC. 





sq. in. 



sq. in. 





Tons. 





R. 9. 



7651 



















— 



— 



7475 



•0249 



14-790 



39'35 2 



— 



— 



738i 



•0387 



16*624 



39355 



— 



— 



•7283 



•0550 



18-248 



39"357 



— 



— 



•7140 



•O787 



20*056 



39*33 8 



— 







•6925 



'II76 



22*036 



38-858 



These tests were all made in the 100-ton testing machine 

 in the Whitworth Laboratory, Owens College. 



