428 



REPORT 1887. 



Table III.— 'Showing the Results of subjecting Bars to Repeated Variations 

 of Tensile Stress. 



Table IV. — Showing the Results of subjecting Bars to Repeated Variations 



of Transverse Strain. 



(Bars made of spring steel manufactured by Krupp.) 



In the case of the iron bar it will be noticed that the specimen was 

 able to bear 10,141,045 applications of a tensile stress of 34,240 lbs. before 



' Unbroken. 



Not broken by this number of applications of the load. 



