WROUGHT IRON
444
No. 7421.
Norway Iron.
Diameter, 1".129.
Sectional area, 1 square inch.
Gauged length, 10".
Applied loads per square inch.	In gauged length.		
	Elonga- tion.	Set.	Remarks.
Pounds.	Inches.	Inch.	
1,000	0.	0.	
5,000	.0015	0.	
10,000	.0034		Elastic limit below 20,000 pounds.
20,000	.0300	.0231	
21,000	.0430		
22,000	.1200		
23,000	.23		
24,000	.25		
25,000	.29	.28	
Rested without load 1 day.			
1,000	0.	0.	
5,000	.0011	0.	
10,000	.0027		
20,000	.0058		
25,000	.0073	0.	^Micrometer reset .at zero on 8" of the original gauged
28,000	.0081	0.	length.
29,000	.0083		
29,500	.0086	.0002	
30,000	.0979		
31,000	.42		
32,000	.47		
34,000	.55		
36,000	.70		
38,000	.86		
40,000	1.14		
42,000	1.78		
42,520	2.45		Tensile strength.
0	3.37		=33.7 per cent.
Elongation of inch sections: ".22, ".25, ".28, ".28, ".25, ".25, ".50, ".78*, ".32, ".24.
Diameter at fracture, ".61; area, .292 square inch.
Contraction of area, 70.8 per cent.
Appearance of fracture, fibrous.