441
WROUGHT IRON,
No. 7437.
Burden’s Best Iron.
Diameter, 1129.״.
Sectional area, 1 square inch.
Gauged length, 10".
Elastic limit.
Micrometer reset at zero on 8" of the original gauged length.
Second application of load.
Tensile strength. =25.8 per cent.
In gauged length.	
Elonga- tion.	Set.
Inches.	Inch.
0.	0.
.0012	0.
.0030	
.0067	0.
.0102	
/ . 0220	
\ .0285	
.0420	
.0800	
.1790	
.1950	
.2270	.2145
.29	
.38	
.42	.40
vithout load	50 days.
0.	0.
.0010	
.0027	0.
.0059	
.0089	
.0102	0.
.0111	
.0116	.0001
.0128	.0006
.0129	
.0820	
.55	
.62	
.71	
.85	
1.09	
2.10	
2; 58	
Applied loads per square inch.
Pounds.
1,000
5.000 10,000 20,000
29.000 29,100
25.000
26.000
27.000
28.000
29.000
30.000
32.000
34.000
35.000 Rested
1.000
5,000
10.000
20,000
30.000
35.000
39.000
40.000
41.000
41.000 41,200
42.000
44.000
46.000
48.000
50.000 51,400
0
Elongation of inch sections: ".17, ".22, ".25, ".51■24." ,25." ,38." ,״, ".20, ".19, ".17.
Diameter at fracture, ".82; area, .528 square inch.
Contraction of area. 47.2 per cent.
Appearance, fibrous.