258 



REPORT 1867. 



Exp. XXIII.— Bar of Steel from Samuel Osborn, Esq., Sheffield. Mark on 



bar, " 4." 



Before experiment. After experiment. 



Height of specimen -993 inch. -743 inch. 



Diameter of specimen -72 inch. '768 inch. 



Area of specimen -40715 sq. in -46324 sq. in. 



Eesiilts. — Here the strain per square inch (PJ causing rupture is 225,568 lbs., 

 or 100-7 tons ; and the corresponding compression (ZJ per unit of length 

 is -263. Byformxila (13). — The -work (m) expended in producing rupture 

 =29592. 



Exp. XXIV.— Bar of Steel from Samuel Osborn, Esq., Sheffield. Mark on 



bar, " 5." 



Before experiment. After experiment. 



Height of specimen 1-01 inch. .... -697 inch. 



Diameter of specimen -72 inch. .... -79 inch. 



Area of specimen -40715 sq. in -49016 sq. in. 



BesnJts. — Here the strain per square inch (P,) causing rupture is225,5681bs., J 

 " and the corresponding compression (Z,) per unit of length " 



or 100-/ 

 •323. 



is 



=36344 



tons 

 By formula (13). 



-The work (m) expended in producing rupture 



