23
6-INCH E. F. GUNS.
Tube.
No. 7292.
Marks, BT2m3 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Initial load.
Elastic limit.
Tensile strength.
Permanent set.	Successive permanent set.
Inch. 0. 0.	Inch. 0. 0.
	
	
0. .00005	0. .00005
	
	
	
	
	
	
	
Successive elongation per inch.
Inch.
0.
.00010 .00030 .00030 .00035 .00030 .00020 .00010 .00050 .00035 .00100 .00200 .00100
Elongation per inch.
Inch.
0.
.00010 .00040 . 00070 . 00105 .00135 .00155 .00165 .00215 .00250 .00350 . 00550 .00650
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
40.000
42.000
44.000
45.000
46.000
47.000
48.000
49.000 87,400
General summary.
pounds.. 87,400
____do... 44,000
___inch.. .2100
....do... .00165
....do...	.085
......... 30.7
... ".6 from neck ... silky, oblique ...... ".14, ".28*
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.............................