ON THE MECHANICAL PROPERTIES OF STEEL. 



349 



Exp. V. — Bar of Steel from Messrs. John Brown & Co. Mark on bar, " B 5." 



Before experiment. After experiment. 



Height of specimen -99 inch. .... -743 inch. 



Diameter of specimen -72 inch. .... -776 inch. 



Area of specimen '40715 sq. in '47299 sq. in. 



No. 



of 



Exp. 



Weight laid 



on 



specimen. 



Weight laid 



on per square inch 



of section. 



Com- 

 pression 

 in inches 



Remarks. 



1 

 2 



3 

 4 

 5 

 6 



7 

 8 

 9 



lbs. 



37438 

 44966 

 52166 

 589.50 

 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 



•010 

 -015 

 •023 

 -039 

 -068 

 •107 

 ■166 

 •215 

 •243 



No cracks. 



Results. — Here the strain per square inch (P,) causing rupture is 

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

 length is -243. By formula (13).— The work (tt) expended in producing 

 rupture =27342. 



Exp. VI. — Bar of Steel from Messrs. John Brown & Co. Mark on bar, " B 6.' 



Before experiment. After experiment. 



Height of specimen -987 inch ^592 inch. 



Diameter of specimen -72 inch. .... -84 inch. 



Area of specimen -40715 sq. in -55417 sq. in. 



41-049 

 49-303 

 57-198 

 64-637 

 72-391 

 80-233 

 87-952 

 96-636 

 100-700 



-050 

 •075 

 •123 

 •179 

 •238 

 •297 

 •346 

 •385 

 •403 



No cracks. 



Results. — Here th^e strain per square inch (PJ causing rupture is 

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

 of length is -403. By formula (13).— The work (m) expended in producing 

 rupture =45345. 



