134 



REPORT — 1869. 



Exp. V. — Bar of Steel from the Barrow Haematite Steel and Iron Company. 



Mark on bar, "H:2 + ." 



Before experiment. 



Height of specimen -981 inch. 



Diameter of specimen -72 inch. 



Area of specimen -4071 sq. in. 



After experiment. 



-553 inch. 

 1-02 inch. 



•8168 sq. in. 



Results. — Here the strain per square inch (PJ causing rupture is 225,5681bs., 

 or 100-7 tons, and the corresponding compres.siou (J^) per unit of length is 

 •525. By formula (13). — The work («) expended in producing rupture 

 = 59211. 



Exp. VI. — Bar of Steel from the Barrow Haematite Steel and Iron Company. 



Mark on bar, "H3-f ." 



Before experiment. 



Height of specimen ^97 inch. 



Diameter of specimen .... -72 inch. 

 Area of specimen ^4071 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 



After experiment. 

 •504 iach. 

 1-07 inch. 

 •8984 sq. in. 



Slight cracks 



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

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

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

 = 53459. 



