25
6-INCH E. F. GUNS.
Tube.
No. 7297.
Marks,
Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds.	Inch.	Inch.	Inch.	Inch.	
1,000	0.	0.	0.	0.	
5,000	.00010	.00010	0.	0.	
10,000	.00030	.00020			
20,000	.00060	. 00030			
30,000	. 00095	.00035			
35,000	.00110	.00015	0.	Ó.	*
40,000	.00140	. 00030			
42,000	. 00150	.00010	0.	0.	
47,000	.00170	. 00020			
48,000	.00180	.00010			Elastic limit.
49,000	.00200	. 00020			
50,000	. 00220	.00020			
51,000	.00295	. 00075			
52,000	. 00450	.00155			
53,000	. 00710	. 00260			
87,000					Tensile strength.
General summary.
pounds.. 87,000
....do... 48,000
...inch.. .2350
----do... .00180
----do...	.155
......... 51.9
. ".75 from neck ..........silky
11." ,*36.״......
Tensile strength per square inch of original section...
Elastic limit per square inch of original section......
Elongation per inch after rupture......................
Elongation per inch under strain at elastic limit......
Reduction in diameter at point of rupture..............
Reduction in area after rupture, per cent of original section
Position of rupture....................................
Character of broken surface................................
Elongation of inch sections................................