260 



BEPORT 1867. 



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



bar, " 8." 



Before experiment. After experiment. 



Height of specimen -984 inch. .... '652 inch. 



Diameter of specimen -72 inch. .... -812 inch. 



Area of specimen -40715 s(j. in -51784 sq. in. 



No. 



of 



Exp. 



Weight laid 



on 



sisecimen. 



Weight laid 



ou per square inch 



of section. 



Com- 

 pression, 



Eemarks. 



lbs. 

 37438 

 44966 

 52166 

 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 



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 



-030 

 •035 

 •063 

 •099 

 •158 

 •217 

 -266 

 •315 

 •333 



No cracks. 



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

 lbs., or 100^7 tons ; and the corresponding compession (IJ per unit of length 

 is •333. By formula (13). — The work (m) expended in producing rupture 

 = 37469. 



Exp. XXYIII.— Bar of Steel from Messrs. Bessemer and Co., Sheffield. Mark 



on bar, "BS 1." 



Before experiment. After experiment. 



Height of specimen -993 inch. .... '773 inch. 



Diameter of specimen ^72 inch. .... ^764 inch. 



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



37438 

 44966 

 52166 

 58950 

 66022 

 73134 

 80214 

 88134 

 91840 



16-713 



20-074 

 23-288 

 26-316 

 29-474 

 32-049 

 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 

 •068 

 -097 

 •146 

 •195 

 •223 



No cracks. 



Results. — Here the strain per square inch (PJ causing ruptm-e is 

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

 of length is -223. By formula (13). — The work (w) expended in producing 

 rupture =25092. 



