ON THE MECHANICAL PROPERTIES OF STEEL. 



137 



Exp. XI. — Bar of Steel from the Heaton Steel and Iron Company, Langley 



Mills. Mark on bar, "2." 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... -74 inch. 



Diameter of specimen -72 inch. .... -908 inch. 



Area of specimen -4071 sq. in -6475 sq. in. 



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

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

 is -288. By formula (13). — The work («) expended in producing rapture 

 = 32481. 



Exp. XII. — Bar of Steel from the Heaton Steel and Iron Company, Langley 



Mills. Mark on bar, " 3." 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... •76 inch. 



Diameter of specimen ^72 inch. .... '866 inch. 



Area of specimen ^4071 sq. in •5898 sq. in. 



•060 

 •070 

 •090 

 •120 

 •170 

 •200 

 •230 

 •257 



'No cracks. 



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

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

 is ^257. By formula (13). — The work (ti) expended in producing rupture 

 = 28985. 



