ON THE MECHANICAL PROPERTIES OF STEEL. 251 



Exp. IX. — Bar of Steel from Messrs. John Brown & Co., Sheffield. Mark 



on bar, " B 9." 



Before experiment. After experiment. 



Height of specimen -983 inch. -430 inch. 



Diameter of specimen -72 inch. .... -QS inch. 



Area of specimen . . -40715 sq. in -75429 sq. in. 



No. 



of 



Exp. 



Weight laid 

 on 

 specimen. 



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 



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 



Com- 

 pression, 

 in inches 



-150 

 -215 

 -273 

 -359 



•418 

 -457 



•486 

 -535 

 -553 



Remarks. 



Commenced to crack. 



Three large cracks. 

 Much cracked. 



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

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

 is -553. By formula (13). — The work (w) expended in producing rupture 



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



bar, " 1." 



„ . , , ^ . Before experiment. After experiment. 



Height ol specimen -971 inch. .... -749 inch. 



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



Area of specimen -40715 sq. in -46808 sq. in. 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



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 



-010 

 •015 

 -023 

 -029 

 -058 

 -087 

 -146 

 -205 

 •233 



No cracks. 



Results.— Rere 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 formula (13). — The work (m) expended in producing rupture 



