447
WROUGHT IRON,
No. 7424.
\ Norway Iron, j 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.
Applied loads, per square inch.	In gauged length.	
	Elonga- tion.	Set.
Pounds. 1,000 5,000 10,000 20,000 21,000 22,800 22,000 22,500 23.000 24.000 25.000	Inches. 0. .0015 .0031	Inch. 0. 0.
	.0068 .0070	0.
		
	.0078	.0008
	.24	
	.27	
	.30	.29
Rested without load 7 days.
1,000 0. ! 0.
5,000	.0010	0.
10,000 20,000
25.000
28.000 29,000 29,500
Tensile strength. =82.4 per cent.
.0010
.0025
.0054
.0067
.0076
.0079
.0083
.0088
.0386
.0955
.41 .44 .52 .60 .71 .89 1.09 1.60 2.25 3.24
30.000
31.000
31.000
32.000
34.000
36.000
38.000
40.000
42.000
44.000 44,640
0
Elongation of inch sections: ".20, ".25, ".32, ".87*, ".31, ".26, ".28, ".29, ".25, ".21.
Diameter at fracture, ".65; area, .332 square inch.
Contraction of area, 66.8 per cent.
Appearance of fracture, fibrous.