Uniform Stress and Permanent Strain. 



Fig. I. 



STRESS-STRAIN DIAGRAM. 



Form of diagram for constant 

 ratio of loading from zero. 



Diagram for bar subject to 

 initial stress of 16 tons with 

 increase of load every 20 

 minutes. 



Diagram for bar subject to 

 initial stress of 16 tons kept 

 constant for 18 hours. 



Diagram for bar subject to 

 initial stress of i6"j tons 

 kept constant for 46 hours. 



Permanent Set in a length of 10 inches. 



