136 

 Exp. IX. 



REPORT 1869. 



-Bar of Steel from the Barrow Hfematite Steel and Iron Company. 

 Mark on bar, " H 6 + ." 



Before experiment. 



Height of specimen -985 inch. 



Diameter of specimen .... -72 inch. 

 Area of specimen -4071 sq. in. 



After experiment. 



•586 inch. 

 1-012 inch. 



•8042 sq. in. 



No. 



of 



Exp. 



1 



2 

 3 

 4 

 5 

 6 

 7 



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. 



Remarks. 



•075 

 •100 

 •150 

 •200 

 •260 

 •300 

 •320 

 •383 

 -400 



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 -4. By formula (13). — The work (w) expended in producing rupture 

 = 45113. 



Exp. X. (April 1869).— Bar of Steel from the Heaton Steel and Iron Com- 

 pany, Langley Mills. Mark on bar, " 1." 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... -723 inch. 



Diameter of specimen .... -72 inch. .... -906 inch. 



Area of specimen -4071 sq. in. ..'..' -6448 sq. in. 



19-913 

 23-284 

 26-627 

 30-777 

 33-977 

 36-777 

 37-977 

 39^670 

 41^000 



No cracks, 



Results. — Here the strain per square inch (PJcausingrupture is 225,568 lbs., 

 or 100-7 tons, and the corresponding compression (Z,) per unit of length 

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



=^ OiOOt, 



