222 



REPOKT 1867. 



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

 taken on 8 inches length. Mark on bar, " B 2." Diameter of speci- 

 men -744 inch. Area -4347 square inch. Reduced diameter after 

 fracture -74 inch. Area -43 square inch. 



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

 91,520 lbs., or 40^85 tons ; and the corresponding elongation {\) per unit of 

 length is •0275. By formula (13).— The work (w) expended in producing 

 rupture =686. 



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

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

 •602 inch. Area ^2846 square inch. Reduced diameter after fracture 

 •602 inch. Area ^2846 square inch. 



BesuUs.—RexQ the breaking strain (P,) per square inch of section is 

 106 714 lbs., or 47-64 tons ; and the corresponding elongation (Z,) per unit 

 of length is ^0143. By formula (13).— The work («) expended in produ- 

 cing rupture =763. 



