126 



KEPORT 1869. 



Exp, VII.— Bar of Steel from the Barrow Hcematite Steel and Iron Company . 

 Elongations taken on 8 inches length. Mark on bar, "H4 + ." 

 Diameter of specimen -768 inch. Area -4039 square inch. Reduced 

 diameter after fracture -768 inch. Area -4639 square inch. 



Breaking-strain per 

 square inch of section. 



lbs. 



75736 



tons, 



33-81 



Remarks. 



Broke in neck. 



Results. — Here the breaking-strain (PJ per square inch of section is 75,736 

 lbs., or 33-81 tons, and the corresponding elongation (/J per unit of length 

 is •0906. By formula (13). — The work (u) expended in producing ruptui-e 

 = 3430. 



Exp. VIII. — Bar of Steel from the Barrow Hasmatite Steel and Iron Com- 

 pany. Elongations taken on 8 inches length. Mark on bar, " H 5 + ." 

 Diameter of specimen -76 inch. Area -4536 square inch. Reduced 

 diameter after fracture -558 inch. Area -2366 square inch. 



74,016 lbs., or 33^04 tons, and the corresponding elungation (Z,) per unit of 

 length is ^0765. By formula (13). — The work (ii) expended in producing 

 rupture =2831. 



