336 



REPORT — 1867. 



Exp, XXX. — Bar of Steel from Messrs. Bessemer & Co., Sheffield. Elouga- 

 tions taken on 8 inches length. Mark on bar, " B S 3." Diameter of 

 specimen -736 inch. Area •4254 square inch. Eeduced diameter 

 after fi'aeture '486 inch. Area •1885 square inch. 



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

 78,606 lbs., or 35*09 tons ; and the corresponding elongation (?,) per unit of 

 length is •0981. By formula (13). — The work (») expended in producing 

 rupture =3855. 



Exp. XXXI. — Bar of Steel from Mr. Sanderson, Sharrow Yale Works. 

 Elongations taken on 8 inches length. Mark on bar, "S 1." Dia- 

 meter of specimen ^697 inch. Area' ^3815 square inch. Eeduced 

 diameter after fracture -694 inch. Area ^3782 square inch. 



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

 83,484 lbs., or 37*26 tons ; and the corresponding elongation (Z,) per unit of 

 length is •0187. By formula (13). — The work (m) expended in producing 

 rupture =780. 



