445
WBOUGHT IKON־,
No. 7422.
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		
20,000	.0069	0.	
25,000	.0095	.0001	Elastic limit.
25,000'	.2770		Second application.
26,000	.31		
27,000	.36		
28,000	.40		
29,000	.44		
30,000	.50	.48	
Rested	without load 1 day.		
1,000	0.	0.	
5,000	.0011	0.	
10,000	.0028		
20,000	.0060		
30.000 33.000	.0090 .0099	0.	Micrometer reset at zero on 8" of the original gauged length.
34,000	.0103	0.	
34,500	.0106		
35,000	.0111	.0006	
35,000	.0980		Second application.
35,000	.60		
36,000	.61		
37,000	.70		
38,000	.74		
40,000	.90		
42,000	1.20		
43,000	1.55		
44,000	2.15		Tensile strength.
0	3.57		=35.7 per cent.
Elongation of inch sections: ".21, ".26, ".33, ".87*, ".48, ".35, ".32, .28, ".24, ".23.
Diameter at fracture, ".60; area .283 square inch.
Contraction of area, 71.7 per cent.
Appearance of fracture, fibrous.