128 



REPORT 1869. 



Exp. XI. — Bar of Steel from the Heaton Steel and Iron Company, Langley 

 Mills. Elongations taken on 8 inches length. Mark on bar, " 2." 

 Diameter of specimen -758 inch. Area -4512 square inch. Eeduced 

 diameter after fracture -758 inch. Area -4512 square inch. 



Jiesults. — Here the breaking-strain (P,) per square inch of section is 93,526 lbs., or 

 41-752 tons, and the corresponding elongation (/j) per unit of length is -0312. By formula 

 (13). — The work (m) expended in producing rupture = 1459. 



Exp. XII. — Bar of Steel from the Heaton Steel and Iron Company, Langley 

 Mills. Elongations taken on 8 inches length. Mark on bar, " 3." 

 Diameter of specimen ^746 inch. Area ^4370 square inch. Eeduced 

 diameter after fracture •626 inch. Area ^3077 square inch. 



Ecsults. — Here the breaking-strain (Pj) per square inch of section is 113,178 lbs., or 

 50-526 tons, and the corresponding elongation {/^) per unit of length is -0937- By for- 

 mula (13).— The work {u) expended in producing rupture = 5302. 



