ON THE MECHANICAL PROPERTIES OF STEEL. 



227 



Exp. XII. — Bar of Steel from Messrs. CammeU & Co., SheiReld. Elonga- 

 tions taken on 8 inches length. Mark on bar, " 3." Diameter of 

 specimen "609 inch. Ai-ea '2912 square inch. Reduced diameter 

 after fracture -605 inch. Area -2874 square inch. 



Besults. — Here the breaking strain (PJ per square inch of section, is 

 120,398 lbs., or 53-75 tons ; and the corresponding elongation (1^) per unit of 

 length is -0281. By formula (13). — The work («) expended in producing 

 rupture = 1691. 



Exp. XIII. — Bar of Steel from Messrs. CammeU & Co., Sheffield. Elonga- 

 tions taken on 8 inches length. Mark on bar, " 4." Diameter of 

 specimen -738 inch. Area -4277 square inch. Reduced diameter after 

 fracture ^729 inch. Area ^4173 square inch. 



Hesidfs. — Here the breaking strain (Pj) per square inch of section is 

 96,665 lbs., or 43-15 tons; and the corresponding elongation (l^) per unit of 

 length is -0250. By formula (13). — -The work (m) expended in producing 

 rupture =1208. 



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