ON THE MECHANICAL PROPERTIES OF STEEL. 



125 



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

 Elongations taken on 8 inches length. Mark on bar, " H 2 + ." Dia- 

 meter of specimen -764 inch. Area -458-1: square inch. Eeduced 

 diameter after fracture -568 inch. Area -2690 square inch. 



Besults. — Here the breaking-strain (P^) per square inch of section is 

 73,241 lbs., or 32-69 tons, and the corresponding elongation (Z^) per unit of 

 length is -0312. By formula (13). — The work (m) expended in producing 

 ruptui-e = 1142. 



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

 Elongations taken on 8 inches length. Mark on bar, " H 3-)-." Dia- 

 meter of specimen -771 inch. Area ^4656 square inch. Reduced 

 diameter after fracture -598 inch. Area ^2808 square inch. 



Resxdts. — Here the breaking-strain (PJ per square inch of section is 

 68,758 lbs., or 30-69 tons, and the corresponding elongation {I ) per unit of 

 length is -0812. By formula (13).— The work (w) expended ni producing 

 rupture = 2791. 



