435
WROUGHT IRON.
No. 7419.
Burden’s Best Iron.
Diameter, 1129,״.
Sectional area, 1 square inch.
Gauged length, 10".
Remarks.
Elastic limit.
►Micrometer reset at zero on the original gauged length.
Tensile strength. 28.5 per cent.
Applied loads per square inch.	In gauged length.	
	Elonga- tion.	Set.
Pounds.	Inches.	Inch.
1,000	0.	0.
5,000	.0012	0.
10,000	.0030	
20,000	.0064	0.
39,000 29,600	.0102	
29,700	.1920	
30,000	.2030	
32,000	.28	
35,000	.39	.37
Rested	without load 1 day.	
1,000	0.	0.
5,000	.0007	
10,000	.0023	
20,000	.0063	
30,000	.0108	
35,000	.0128	
36,000	.0130	
37,000	.0135	
38,000	.0138	
38,500	.0142	
39,000	.0155	
39,500	.0910	
40,000	.1600	
41,000	.59	
42,000	. 65	
44,000	.82	
46,000	1.08	
48,000	1.84	
48,100	2.25	
0	2.85	
Elongation of inch sections: ".19, ".24, ".26, ".26, ".29, ".43, ".51* ".27, ".23, ".17.
Diameter at fracture, ".84; area, .554 square inch.
Contraction of area, 44.6 per cent.
Appearance of fracture, fibrous.