130 



REPORT 1869. 



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

 Mills. Elongations taken on 8 inches length. Mark on bar, " 6." 

 Diameter of specimen -754 inch. Area -4465 square inch. Ee- 

 duced diameter after fracture •528 inch. Area -2560 square inch. 



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

 105,093 lbs., or 46-915 tons, and the corresponding elongation (?,) per unit 

 of length is ^1041. By formula (13). — The work («) expended in producing 

 rupture = 5464. 



