ON THE MECHANICAL PROPERTIES OF STEEL. 



259 



Exp. XXV. — Bar of Steel from Samuel Osborn, Esq., Sheffield. Mark on 



bar, " 6." 



Before experiment. After experiment. 



Height of specimen '982 inch .... -669 inch. 



Diameter of specimen '72 inch. .... -80 inch. 



Area of specimen •40715 sq. in •50265 sq. in. 



No. 



of 



Exp 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



Weight laid 



on 



specimen. 



lbs. 

 37438 

 44966 

 52166 

 58950 

 66022 

 73134 

 80214 

 88134 

 91840 



tons. 

 16-713 

 20-074 

 23-288 

 26-316 

 29-474 

 32-640 

 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 ins. 



-030 

 •045 

 •073 

 •099 

 •148 

 •207 

 •266 

 •305 

 •323 



Remarks. 



No cracks. 



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

 or 100-7 tons; and the corresponding compression (ZJ per unit of length 

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

 =36344. 



Exp. XXVI.— Bar of Steel from Samuel Osborn, Esq., Sheffield. Mark on 



bar, "0 7." 



Before experiment. After experiment. 



Height of specimen 1-011 inch -826 inch. 



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



Area of specimen -40715 sq. in -43943 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 



•010 

 •015 

 •023 

 •029 

 •038 

 •077 

 -106 

 •165 

 •193 



No cracks. 



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

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

 of length is -193. By formula (13). — The work (u) expended in producing 

 rupture =21716. 



I2 



