ON THE MECHANICAL PROPERTIES OP STEEL, 



231 



Exp. XX. — Bar of Steel from Messrs. Osbom & Co., Sheffield. Elongations 

 taken on 8 inches length. Mark on bar, " 1." Diameter of specimen 

 •745 inch. Area -4359 square inch. Reduced diameter after fracture 

 •739 inch. Area -4289 square inch. 



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

 98,942 lbs., or 44^17 tons; and the corresponding elongation (\) per unit 

 of length is •0156. By formida (13). — The work (u) expended in producing 

 rupture = 771. 



Exp. XXI. — Bar of Steel from Messrs. Osborn & Co., Sheffield, Elongations 

 taken on 8 inches length. Mark on bar, " 2." Diameter of specimen 

 •731 inch. Area ^4196 square iach. Reduced diameter after fracture 

 •721 inch. Area '4082 square inch. 



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

 123,686 lbs., or 55-21 tons; and the corresponding elongation {\) per unit 

 of length is -0318. By formula (13). — The Avork (m) expended in producing 

 rapture = 1966. 



