ON THE MECHANICAL PROPERTIES OF STEEL. 



257 



Exp. XXI, — Bar of Steel from Samuel Osbom, Esq., Sheffield Mark on 



bar, « 2." 



Before experiment. After experiment. 



Height of specimen -991 inch. .... -766 inch. 



Diameter of specimen -72 inch. .... -70 inch. 



Area of specimen -40715 sq. in -45364 sq. in. 



Bemarks. 



No cracks. 



Eesults. — Here the strain per square inch(Pj) causing rupture is 225,568 lbs. , 

 or 100^7 tons; and the corresponding compression (l^) per unit of length 

 is -243. By formula (13). — The work (u) expended in producing rupture 

 =27342. 



Exp. XXII. — Bar of Steel from Samuel Osbom, Esq., Sheffield. Mark on 



bar, " 3." 



Before experiment. After experiment. 



Height of specimen ^986 inch. .... -748 inch. 



Diameter of specimen ^72 inch. .... ^768 inch. 



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



16-713 

 20-074 

 23-288 

 20-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



91951 

 1 10440 

 128124 

 144786 

 162156 

 179722 

 197023 

 216465 

 225568 



41-049 

 49-303 

 57-198 

 64-637 

 72-391 

 80-233 

 87-952 

 96-636 

 100-700 



•030 

 •035 

 •043 

 •059 

 •078 

 •117 

 -166 

 •225 

 •253 



No cracks 



Results. — Here thestrain per square inch (Pj)causing rupture is 225,5681bs., 

 or 100^7 tons ; and the corresponding compression (?j) per unit of length 

 is ^253. Bj' formula (13). — The work (it) expended in producing rupture 

 1=28467. 



1867. 1 



