WROUGHT IRON".
438
No. 7434.
Burden’s Best Iron.
Diameter, 1".129.
Sectional area, 1 square inch.
Gauged length, 10".
Applied loads per square inch.	In gauged length.		Remarks.
	Elonga- tion.	Set.	
Pounds.	Inches.	Inch.	
1,000	0.	0.	
5,000	.0012	0.	
10,000	.0030		
20,000	. 0065	0.	
29,300	.0101		Elastic limit.
29,500	.1970		
30,000	.2083	.1960	
31,000	.24		
32,000	.27		
33,000	.30		
34,000	.34		
35,000	.38	.37	
Rested without loac		7 days.	
1,000	0.	0.	
5,000	.0013	0.	
10,000	.0027		
20,000	.0059		Micrometer reset at zero on 8" of the original gauged
30.000 35.000	.0090 .0106..	0.	length.
־ 39,000	.0120®		
40,000	.0127	.0006	
40,000	.0134		Second application of load.
41,000	.51		
42,000	.55		•
44,000	.66		
46,000	.81		
48,000	1.09		
49,000	1.30		
49,560	1.83		Tensile strength.
0	2.58		=25.8 per cent. ^
Elongation of inch sections: ".17, ".21, ".22, ".23, ".27, ".57*, ".28, ".24, ".20, ".19.
Diameter at fracture, ".85; area, .567 square inch.
Contraction of area, 43.3 per cent.
Appearance, fibrous.