ON THE MECHANICAL PROPERTIES OF STEEL. 



263 



Exp. XXXIII.— Bar of Steel from Messrs. Sanderson & Co., Sheffield. Mark 



on bar, " S 3." 



Before experiment. After experiment. 



Height of specimen -99 inch. .... -710 inch. 



Diameter of specimen -72 inch. .... -768 inch. 



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



Besults. — Here the strain per square inch (P^) causing rupture is 225,568 

 lbs., or 100-7 tons ; and the corresponding compression (/J per unit of length 

 is -283. By formula (13). — The work (ii) expended in producing rupture 

 =31843. 



Exp. XXXIV.— Bar of Steel from Messrs. Sanderson & Co., Sheffield. Mark 



on bar, " S 4." 



Before experiment. After experiment. 



Height of specimen ^977 inch. .... •658 inch. 



Diameter of specimen ^72 inch. .... -794 inch. 



Area of specimen ^40715 sq. in ^49514 sq. in. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



37438 

 44966 

 52166 

 5S950 

 66022 

 73134 

 80214 

 88134 

 91840 



16-713 

 20-074 

 23-288 

 26-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



91951 

 110440 

 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 

 •053 

 •079 

 •128 

 ■187 

 •246 

 •295 

 •323 



Several slight cracks. 



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

 lbs., or 100-7 tons ; and the corresponding compression {1^ per unit of length 

 is -323. By formula (13). — The work (w) expended in producing rupture 

 =36344. 



