433
WEOUGHT IKON.
No. 7409.
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		
10,000	.0027		
15,000	.0045		
20,000	.0063	-.0001	
25,000	.0082		
30,000	.0106	.0007	Elastic limit.
30,000	.2020		Load reapplied.
31,000	.24		
32,000	.27		
33,000	.30		
34,000	.33		
36,000	.40		
38,000	.50		
40,000	.60		
42,000	.74		
44,000	.93		
46,000	1.25		
48,000	2.15		Tensile strength.
0	2.73		=27.3 per cent.
Elongation of inch sections: ".20, ".27, ".53*, ".32, ".27, ".24, ".24, ".25, ".24, ".17.
Diameter at fracture, ".88; area, .608 square inch.
Contraction of area, 39.2 per cent.
Appearance, fibrous.
H. Doc. 508—-28