253 



REPORT— 1867. 



Exp. XI. — Bar of Steel from Messrs. Cammell & Co., Sheffield. Mark on 



bar, « 2." 



Before experiment. After experiment. 



Height of specimen 1-005 inch. .... -749 inch. 



Diameter of specimen -72 inch. .... '772 inch. 



Area of specimen •40715 sq. in '46808 sq. in. 



No. 



of 



Exp. 



Weight laid 



on 

 specimen. 



Weight laid 



on per square inch 



of section. 



Compres- 

 sion, in 

 inches. 



Remarks. 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



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 



•020 

 •025 

 •033 

 •049 

 •068 

 •117 

 •176 

 •235 

 •263 



No cracks. 



Besidts. — Here the strain per square inch (P^) causing rupture is 225,568 

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

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

 = 29592. 



Exp. XII. — Bar of Steel from Messrs. CammeU & Co., Sheffield, Mark on 



bar, " 3."„ 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... -705 inch. 



Diameter of specimen -72 inch. .... ^79 inch. 



Area of specimen "40715 sq. in "49016 sq. in. 



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 



•020 

 •035 

 •053 



•089 

 •138 

 •187 

 •236 

 •285 

 •313 



Besults.—Kere the strain per square inch (Pj) causing rupture is 225,568 

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

 is -313. By formula (13). — The work (w) expended in producing rupture 

 = 35218. 



