449
WROUGHT IRON.
No. 7426.
Norway Iron.
Diameter, 1".129.
Sectional area, 1 square inch.
Gauged length, 10".
Applied loads per square inch.	In gauged length.		Remarks.
	Elonga- tion.	Set.	
Pounds.	Inches.	Inch.	
1,000	0.	0.	
5,000	.0013	0.	
10,000	.0031	0.	
20,000	.0069		
23,000	.0080	.0001	
25,000	.0089	.0003	Elastic limit.
25,000	.2770		Second application.
26,000	.33		
27,000	.36		
28,000	.41		
30,000	.49		
32,000	.60		
34,000	.73		
35,000	.82	.80	
Rested without loac		7 days.	
1,000	0.	0.	
5,000	.0012	0.	
10,000	.0029		
20,000	.0061		
30.000 35.000	.0093 .0109		Micrometer reset at zero on 8" of the original length.
40,000	.0126	.0001	
40,500	.0128		
41,000	.0131	.0005	
42,000	.1358		
42,000	.97		
43,000	.98		
44,000	1.06		
45,000	1.12		
46,000	1.20		
47,000	1.33		
48,000	1.55		
48,480	1.98		Tensile strength.
0	3.00		=30 per cent.
Elongation of inch sections: ".19, ".20, ".22, ".24, ".31, ".85*, ".31, ".25, ".23, ".20.
Diameter at fracture, ".63; area, .312 square inch.
Contraction of area, 68.8 per cent.
Appearance of fracture, fibrous.
Load at time of fracture, 31,800 pounds total.
H. Doc. 508-----29