240 



REPORT 1867. 



Exp. XXXVIII.— Bar of Stoel from Messrs. Turtou cfe Sons, Sheffield. 

 Elongations taken on 8 inches length. Mark on bar, " C." Diameter 

 of specimen -743 inch. Area -4335 square inch. Eeduced diameter 

 after fracture -74 inch. Area -43 square inch. 



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

 95,372 lbs., or 42-57 tons ; and the corresponding elongation (\) per unit of 

 length is -0181. By formula (13). — The work (if) expended in producing 

 rupture ^ 863. 



Exp. XXXIX.— Bar of Steel from Messrs. Turfcon & Sons, Sheffield. Elon- 

 gations taken on 8 inches length. Mark on bar, " D." Diameter 

 of specimen -719 inch. Area -4060 square inch. Reduced diameter 

 after fracture ^717 inch. Area -4037 square inch. 



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

 80,273 lbs., or 35-02 tons ; and the corresponding elongation (l^) per unit of 

 length is •0018. By formula (13). — The work (h) expended in producing 

 rupture = 72. 



