238 



REPORT 1867. 



Exp, XXXIV. — Bar of Steel from Mr. Sandersou, Sharrow Vale Works. 

 Elongations taken on 8 inches length. Mark on bar, " S 4." Diameter 

 of specimen '744 inch. Area '4374 square inch. Eeduced diameter 

 after fracture "737 inch. Area '4266 square inch. 



No. 



of 



Exp. 



1 

 2 

 3 

 4 

 5 

 6 

 7 



Weight 

 laid on. 



lbs. 

 22009 

 25369 

 27049 

 28729 

 30304 

 31849 

 32689 



Breaking strain per 

 square inch of section. 



lbs. 



75199 



tons 



33-57 



Per unit of length. 



Elongation. 



•0031 

 •0043 

 •0081 

 •0087 

 •0125 

 •0137 



Permanent 

 set. 



•0125 



Remarks. 



Bar of faggot steel 

 drawn from ^ 

 bar steel, simply 

 ■vrelded to make 

 it sound. 



Broke in neck. 



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

 75,199 lbs., or 33*57 tons ; and the corresponding elongation (l^ per unit 

 of length is -0137. By formula (13). — The work (it) expended in producing 

 rupture = 515. 



Exp. XXXV. — Bar of Steel from Mr. Sanderson, Sharrow Vale "Works. 

 Elongations taken on 8 inches length. Mark on bar, " S 5." Diameter 

 of specimen '738 inch. Area ^4277 square inch. E«dueed diameter 

 after fracture ^723 inch. Area -4105 square inch. 



I 



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

 103,960 lbs., or 46^41 tons; and the corresponding elongation (?,) per unit 

 of length is ^0262. By formula (13). — The work {u) expended in' producing 

 rupture = 1782. 



