437
WROUGHT IRON.
No. 7433.
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	.0011	0.	
10,000	.0030		
20,000	.0067	0.	
29,500	.0101		Elastic limit.
29,800	.2110		
30,000	. 2200	.2078	
Rested without load 7 days.			
1,000	0.	0.	
5,000	.0011	0.	
10,000	.0026		
20,000	. 0056		Micrometer reset at zero on 8" of the original gauged
30,000	.0085	0.	length.
34,700	.0102		
35,000	.0106	.0006	
35,00Ò	.0814		Second application of load.
36,000	.34		
38,000	.42		
40,000	.50		
42,000	.61		
44,000	.75		
46,000	.96		
48,000	1.51		
48,560	1.98		Tensile strength.
0	2.59		= 25.9 per cent.
Elongation of inch sections: ".17, ".20, ".21, ".22, ".24, ".25, ".32, ".56*, ".24, ".18.
Diameter at fracture, ".82; area, .528 square inch.
Contraction of area, 47.2 per cent.
Appearance of fracture, fibrous.