350 



REPORT 1867. 



Exp. VII.— Bar of Steel from Messrs. John Brown & Co. Marklon bar, " B 7." 



Before experiment. After experiment. 



Height of gpeeimen -101 inch. .... -559 inch. 



Diameter of specimen -72. inch. . . ; . '886 inch. 



Area of specimen '40715 sq. in -61653 sq. in. 



No. 



of 



Exp. 



1 



2 



3 

 4 

 5 

 6 



7 

 8 

 9 



Remarks. 



Three large cracks, 

 with several 

 smaller ones. 



Hesults. — Here the strain jjer square inch (PJ causing rupture is 

 225,568 lbs., or 100-7 tons ; and the corresponding compression (l^) per unit of 

 length is -443. By formula (13). — The Avork (u) expended in producing 

 rupture =49846. 



Exp. VIII,— Bar of Steel from Messrs. John Brown & Co. Mark on bar, " B 8." 



Before experiment. After experiment. 



Height of specimen -989 inch. .... -497 inch. 



Diameter of specimen '72 inch. .... ^886 inch. 



Area of specimen "40715 sq. in -61653 sq. in. 



]Much cracked. 



IS 



Results. — Here the strain per square inch (P^) causing ruj^ture 

 225,568 lbs., or 100-7 tons ; and the corresponding compression (/j) per unit of 

 length is -493. By formula (13). — The work (m) expended in producing 

 rupture = 55472. 



