ON THE MECHANICAL PROPERTIES OP STEEL. 



223 



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

 taken on 8 inches length. Mark on bar, " B 4." Diameter of speci- 

 men -737 inch. Area -4266 square inch. Eeduced diameter after 

 fracture -726 inch. Area '4139 square inch. 



Results. — Here the breaking strain (Pj) per square inch of section is 116,18.3 lbs., or 

 51-86 tons; and the corresponding elongation (l^) per unit of length is 'OSS?. By 

 formula (13). — The work {u) expended in producing rupture = 1957- 



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

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

 cimen •608 inch. Area ^29 square inch. Eeduced diameter after 

 fracture •OO inch. Area ^2827 square inch. 



Results. — Here the breaking strain (Pj) per square inch of section is 110,05.5 lbs., or 

 49-1.3 tons; and the corresponding elongation {Ij) per unit of length is -0375. By 

 ormnla (13). — The work (m) expended in producing rupture — 206.3. 



