166 



BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



Hauiuiered bars gave 24,5 per cent, less in the elastic and 7.2 per cent, 

 in the ultimate, and rolled bars 14.3 and 5 per cent, as the result of 

 annealing. 



The softening of the steel due to annealing is also shown by — 



The increase in the amount of stress borne, both elastic and ultimate, 

 due to the additional work in the manufacture in reducing from 3 inch 

 square to ^ inch square is shown by — 



