ON THE MECHANICAL PROPERTIES OF STEEL, 265 



Exp, XXXYII,— Bar of Steel from Messrs. Turton & Sons, Sheffield. 



Mark on bar, " B." 



Before experiment. After experiment. 



Height of specimen -986 inch. .... -804 inch. 



Diameter of specimen -72 inch. .... -748 inch. 



Area of specimen -40715 sq. in -43943 sq. in. 



No. 



of 



Exp. 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



Weight laid 



on 



specimen. 



lbs. 



37438 

 44966 

 52166 

 58950 

 66022 

 731.34 

 80214 

 88134 

 91840 



tons. 



16-713 

 20-074 

 23-288 

 26-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



Weight laid 



on per square inch 



of section. 



lbs. 



91951 

 110440 

 128124 

 144786 

 162156 

 179722 

 197023 

 216465 

 225568 





tons. 

 41-049 

 49-303 

 57-198 

 64-637 

 72-391 

 80-2.33 

 87-952 

 96-636 

 100-700 



Com- 

 pression 

 in inches 



-020 

 •025 

 -033 

 •039 

 •048 

 •077 

 •116 

 •175 

 •193 



Eemarks. 



No cracks. 



Eesults. — 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 -193. By formula (13). — The work (u) expended in producing rupture 

 = 21716. 1 o i 



Exp. XXX^^III.— Bar of Steel from Messrs. Turton & Sons, Sheffield. 



Mark on bar, " C." 



Before experiment. After experiment. 



Height of specimen -96 inch. .... -716 inch. 



Diameter of specimen -72 inch. .... '781 inch. 



Area of specimen ^40715 sq. in ^47783 sq. in. 



1 

 2 

 3 



4 

 5 

 6 



7 

 8 

 9 



37438 

 44966 

 52166 

 58950 

 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 

 •043 

 •049 

 •078 

 •127 

 •166 

 •225 

 •243 



'No cracks. 



BesuUs.—Rere the strain per square inch (P^) causing rupture is 225,568 lbs., 

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

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

 =27342. ^ 



