ON THE MECHANICAL PROPERTIES OF STEEL. 



139 



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



MiUs. Mark ou bar, " 6." 



Before experiment. 



Height of specimen 1-00 inch. 



Diameter of specimen -72 inch. 



Area of specimen -4071 sq. in. 



After experiment. 

 -734 inch. 

 •903 inch. 

 •5404 sq. in. 



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

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

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

 = 32481. 



