224 



REPORT — 18G7. 



Exp. VI.— Bar of Steel from Messrs. Brown & Co., Sheilfield. Elongations 

 taken on 8 inches length. Mark on bar, " B 6." Diameter of specimen 

 •742 inch. Area -4324 square inch, lleduced diameter after fracture 

 •525 inch. Area •2164 square inch. 



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

 91,972 lbs., or 41^05 tons ; and the corresponding elongation (1^) per unit of 

 length is "0837. By formula (13). — The work (m) expended in producing 

 rupture = 4522. 



Exp. VII. — ^Bar of Steel from Messrs. Brown and Co., Sheffield. Elongations 

 taken on 8 inches length. Mark on bar, " B 7." Diameter of specimen 

 •74 inch. Area '43 square inch. Reduced diameter after fracture 

 •72 inch. Area -4071 square inch. 



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

 92,555 lbs., or 41-31 tons ; and the corresponding elongation (I,) per unit of 

 length is -0406. By formula (13). — The work (m) expended in producing 

 rupture = 1878. 



