234 



REPOHT — 1867. 



Exp. XXYI. — Bar of Steel from Messrs. Osborn & Co., Sheffield. Elongations 

 taken on 8 inches length. Mark on bar, " 7." Diameter of specimen 

 •738 inch. Area -4277 square inch. Reduced diameter after fracture 

 •736 inch. Area -4254 square inch. 



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

 85,724 lbs., or 38-26 tons ; and the corresponding elongation (ZJ per unit of 

 length is •0037. By formula (13). — The work (m) expended in jiroducing 

 rupture = 158. 



Exp. XXVII.— Bar of Steel from Messrs. Osborn & Co., Sheffield. Elongations 

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

 •738 inch. Area -4277 square inch. Reduced diameter after fracture 

 •596 inch. Ai-ea -2789 square inch. 



1 

 2 

 3 

 4 

 5 

 6 

 7 



28729 

 31849 

 35014 

 38224 

 41344 

 44464 

 46054 

 47764 



111676 



49^85 



•0131 

 -0162 

 •0231 

 •0312 

 •0456 

 •0625 

 •1062 



•1350 



Specimen of cast 

 steel for boiler- 

 plates. 



Broke in centre. 



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

 111,676 lbs., or 49^85 tons ; and the corresponding elongation (?,) per unit of 

 length is -1062. By formula (13). — The work (t«) expended in producing 

 rupture = 5930. 



