266 



REPORT 1867. 



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



on bar, " D." 



Before experiment. After experiment. 



Height of si^ecimen -982 inch, .... -751 inch. 



Diameter of specimen -72 inch. .... '774 inch. 



Area of specimen -40715 sq. in -47051 sq. in. 



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

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

 is -263. By formula (13). — The work {u) expended in producing rupture 

 =29592. 



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



bar, " E." 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... -77 inch. 



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



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



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 



•020 

 -025 

 -033 

 -049 

 -068 

 •107 

 •156 

 •205 

 •233 



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 -233. By fonnula (13), — The work (u) expended in producing rupture 

 =26217. 



