ON THE MECHANICAL PROPERTIES OF STEEL. 



225 



Exp, YIII. — Bar of Steel from Messrs. Brown & Co., Sheffield. Elongations 

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

 •607 inch. Area='2893 square inch. Reduced diameter after 

 fracture -555 inch. Area "242 square inch. 



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

 76,774 lbs., or 34^27 tons ; and the corresponding elongation (ZJ per unit of 

 length is •0968. By formula (13). — The work (m) expended in producing 

 rupture =3715, 



Exp, IX. — Bar of Steel from Messrs. Brown & Co., Sheffield. Elongations 

 taken on 8 inches length. Mark on bar, " B 9." Diameter of specimen 

 •606 inch. Area -2884 square inch. Reduced diameter after frac- 

 ture ^41 inch. Area "132 square inch. 



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

 59,538 lbs., or 26"57 tons ; and the corresponding elongation (l^) per unit of 

 length is •0762. By formula (13).-^The work {u) expended in j)roducing 

 rupture =2268, 



18G7, 



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