263 



REPORT — 1867. 



Exp. XXXI.— Bar of Steel from Messrs. Sanderson & Co., Sheffield. 



on bar, " S. 1." 



After experiment, 

 . . -576 inch. 

 . . -850 inch. 

 . . -56745 sq. in. 



Mark 



Before experiment, 



Height of specimen -98 inch. 



Diameter of specimen .... '72 inch. 

 Area of specimen •40715 sq. m. 



No. 



of 



Exp. 



Weight laid 



specimen. 



lbs. 

 374.S8 

 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 



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 



Compres- 

 sion, in 

 inches. 



•030 

 •045 

 -073 

 •139 

 -198 

 •257 

 •316 

 •375 

 •398 



Two large cracks 

 and a small one. 



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

 lbs., or 100^7 tons ; and the coiTcsponding compression (/j) per unit of length 

 is ^398. By formula (13). — The work (t«) expended in producing rupture 

 = 44783. 



Exp. XXXII. — Bar of Steel from Messrs. Sanderson & Co., Sheffield. 



on bar, " S. 2." 



Mark 



Before experiment. 



Height of specimen ^992 inch. 



Diameter of specimen .... ^72 inch. 

 Area of specimen ^40715 sq. ' 



m. 



After experiment. 

 •698 inch. 

 •785 inch. 

 •48398 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 



-030 

 •035 

 •053 

 •079 

 •118 

 •177 

 •236 

 •275 

 -303 



Very slight crack. 



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 -303. By formula (13). — The work (u) expended in producing rupture 

 = 34093. 



