ON THE MECHANICAL PROPERTIES OF STEEL. 269 



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



bar, " U." 



Before experiment. After experiment. 



Height of specimen -984 inch. .... -701 inch. 



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



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



No. 



of 



Exp. 



Weight laid 



on 



specimen. 



lbs. 



37438 

 44966 

 o2166 

 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 



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 

 80-233 

 87-952 

 96-636 

 100-700 



Com- 

 pression, 

 in inches 



-030 

 -035 

 -053 

 -069 

 •118 

 -167 

 -226 

 •275 

 •293 



Remarks. 



No cracks. 



Eesulfs. — 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 -293. By formula (13). — The work (u) expended in producing rupture 

 =32968. 



