ON THE MECHANICAL PROPERTIES OF STEEL. 



267 



Exp. XLI. — Bar of Steel from Messrs. Turton & Sons, Sheffield. Mark on 



bar, « F." 



Before experiment. After experiment. 



Height of specimen 1-0 inch. -748 inch. 



Diameter of specimen -72 inch. .... -785 inch. 



Area of specimen -40715 sq. in -48398 sq. in. 



No. 



of 



Expt. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



Weight laid 



on 



specimen. 



Weight laid 



on per square inch 



of section. 



lbs. 



37438 

 44966 

 52166 

 58950 

 66022 

 73134 

 80214 

 88134 

 91840 



tons. 



16-713 

 20-074 

 23-288 

 26-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



lbs. 



91951 

 110440 

 128124 

 144786 

 162156 

 179722 

 197023 

 216465 

 225568 



tons. 

 41-049 

 49-303 

 57-198 

 64-637 

 72-391 

 80-233 

 87-952 

 96-636 

 100-700 



Com- 

 pression, 

 in inches. 



-020 

 •025 

 -033 

 •049 

 -078 

 -127 

 ■176 

 •225 

 •253 



Remarks. 



No cracks. 



Jlesults. — 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 •253. By formula (13). — The work (m) expended in producing rupture 

 =28467. 



Exp XLII. — Bar of Steel from Messrs. Turton & Sons, Sheffield. Mark on 



bar, " G." 



Before experiment. After experiment. 



Height of specimen -998 inch. .... -71 inch. 



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



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



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 



I 



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



100-7 tons ; and the corresponding compression (Z,) per unit of length 

 is -293. By formula (13). — The work («) expended in producing rupture 

 =32968. 



or 



