256 



REPORT — 1867. 



Exp. XIX.— Bar of Steel from Messrs. Naylor, Vickers & Co., Sheffield. 



Mark on bar, " V.2." 



Before experiment. After experiment. 



Height of specimen -998 inch. .... -818 inch. 



Diameter of specimen -72 inch. .... -76 inch. 



Area of specimen -40715 sq. in -45364 sq. in. 



Results. — Here the strain per square inch (PJcausing rupture is 225,5681bs., 

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

 is -183. By formula (13). — The work (u) expended in producing rupture 

 = 20591. 



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



bar " 1." 



Before experiment. After experiment. 



Height of specimen -999 inch. .... -796 inch. 



Diameter of specimen '72 inch. .... -764 inch. 



Area of specimen -40715 sq. in -45843 sq. in. 



1 

 2 



3 

 4 

 5 

 6 



7 



37438 

 44966 

 52166 

 58950 

 06022 

 73134 

 80214 

 88134 

 91840 



16-713 

 20-074 

 23-238 

 26-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



91951 



110440 

 128124 

 144786 

 162150 

 179722 

 197023 

 216465 

 225568 



41-049 

 49-303 

 57-198 

 64-637 

 72-391 

 80-233 

 87-952 

 96-636 

 100-700 



-020 

 -025 

 •033 

 -039 

 -058 

 •077 

 •126 

 •185 

 •203 



No cracks. 



Results. — Here the strain per square inch (Pj) causing rupture is 225,5681bs., 

 or 100^7 tons ; and the corresponding compression (l^) per unit of length 

 is -203. By formula (13). — The work (u) expended in producing rupture 

 = 22841. 



