238 



REPORT — 1867. 



Exp, XIV. — Bar of Steel from Messrs. Cammell & Co., Sheffield. Elonga- 

 tions taken, on 8 inches length. Mark on bar, " 5." Diameter of spe- 

 cimen "739 inch. Area ^4289 square inch. Reduced diameter after 

 fracture -511 inch. Ai'ea -2042 square inch. 



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

 89,121 lbs., or 39-78 tons ; and the corresponding elongation (\) per unit of 

 length is •1437. By formula (13). — The work (u) expended in producing 

 rapture = 6403. 



Exp. XV. — Bar of Steel from Messrs. Cammell & Co., Sheffield. Elongations 

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

 •611 inch. Area ^2932 square inch. Eeduced diameter after fracture 

 •391 inch. Area '12 square inch. 



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

 81,483 lbs., or 36-37 tons ; and the corresponding elongation (7^) per imit of 

 length is -1200. By formula (13). — The work {ii) expended in producing 

 rupture = 4888. 



