330 



REPORT — 1867. 



Exp. XVIII. — Bar of Steel from Messrs. Naylor, Vickers & Co., Sheffield. 

 Elongations taken on 8 inches length. Mark on bar, "Y S." Dia- 

 meter of specimen -738 inch. Area -4277 square inch. Ecduccd 

 diameter after fracture -734 inch. Area -4231 square inch. 



Besulfs. — Here the breaking strain (P,) per square inch of section is 134,145 lbs., or 

 59-87 tons; and the corresponding elongation {l^) per unit of length is •0100. By 

 formula (13).— The work (u) expended in producing rupture = 670. 



Exr. XIX.— Bar of Steel from Messrs. Naylor, Vickers & Co., Sheffield. 

 Elongations taken on 8 inches length. Mark on bar, " 2-GQ Cast Steel." 

 Diameter of specimen -615 inch. Area -297 square inch. Eeduced 

 diameter after fracture •609 inch. Area -2912 square inch. 



Results. — Here the breaking strain {V-^ per square inch of section is 118,066 lbs., or 

 52*70 tons; and the corresponding elongation (/,) per unit of length is -0287. By- 

 formula (13). — The work (?«) expended in producing ruptiu-e = 1694. 



