439
WROUGHT IRON.
No. 7435.
Burden’s Best Iron.
Diameter, 1".129.
Sectional area, 1 square inch.
Gauged length, 10".
Applied loads per square inch.	In gauge Elonga- tion.	d length. Set.	Remarks.
Pounds.	Inches.	Inch.	
1,000	0.	0.	
5,000	. 0012	0.	
10,000	.0031		
20,000	.0067	0.	
29,400	.0101		Elastic limit.
29,500	.2273		
30,000	.2387	.2263	
31,000	.27		
32,000	.31		
34,000	.38		
36,000	.47		
38,040	.57		
40,000	.72	.70	
Kested without loac		7 days.	
1,000	0.	0.	
5,000	.0012	0.	
10,000	.0027		
20,000	.0060		
30.000 40.000	.0092 .0124	0.	Micrometer reset at zero on 8" oi the original gauged
45,000	. 0138	0.	
45,500	.0144		
46,000	.0149	.0004	
46,500	.1738		
47,000	.1993	.1811	
47,000	.95		
48,000	1.02		
49,000	1.17		
50,000	1.38		
50,500	1.87		Tensile strength.
0	2.44			= 24.4 per cent.
Elongation of inch sections: ".16, ".18, ".21, ".20. ".25 ".52* " 36 ".21, ".19, ".16.	’ '	’
Diameter at fracture, ".80; area, .503 square inch.
Contraction of area, 49.7 per cent.
Appearance of fracture, fibrous.