425
WROUGHT IRON.
No. 7429.
Common Refined Iron. Diameter, 1".129.
Sectional area, 1 square inch. Gauged length, 10".
Remarks.
Elastic limit.
Micrometer reset at zero on 8'׳ of the original gauged length.
Tensile strength. = 19.3 per cent.
Applied loads per square inch.	In gauged length.	
	Elonga- tion.	Set.
Pounds.	Inches.	Inch.
1,000	0.	0.
5,000	.0013	0.
10,000	.0031	
20,000	.0070	
30,000	.0108	0.
35,000	.0129	.0003
36,000	.1925	
38,000	.27	
40,000	.34	
42,000	.42	
44,000	.53	
45,000	.60	.58
Rested	ivithout load 8 days.	
1,000	0.	0.
5,000	.0013	0.
10,000	.0032	
20,000	.0065	
30,000	.0100	
40,000	.0132	
45,000	.0150	0.
48,000	.0159	0.
50,000	.0167	.0002
60,600	.0173	
51,000	.0176	
51,500	.0179	
52,000	.1750	
52,000	.79	
53,000	.83	
54,000	.93	
56,000	1.14	
57,400	1.65	
0	1.93	
Elongation of inch sections: ".15, ".20, ".42*, ".23, ".19, ".17, ".15, ".14, ".15, ".13.
Diameter at fracture, ".95; area, .709 square inch.
Contraction of area, 29.1 per cent.
Appearance of fracture, fibrous, trace of granulation.