12-INCH STEEL В. L. RIFLED MORTARS.
64
Jacket.
No. 7405.
־i\ r 20095 1־ Bg
Marks, mt2m Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.
Inch. 0. .000133 . 000333 .000667 .001000 .001200 .001367 .001433 .001700 .001767 .008833 .009167 .009667 .010667 .011833	Inch. 0. .000133 .000200 . 000334 .000333 .000200 .000167 . 000066 . 000267 . 000067 .007066 .000334 .000500 .001000 .001166	Inch. 0. 0.	Inch. 0. 0.
			
			
		0.	0.
		0.	0.
			
			
			
			
			
			
			
			
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
35.000
40.000
42.000
50.000
51.000
52.000
53.000
54.000
55.000
56.000 91,680
.pounds.. 91,680
____do... 51,000
...inch..	.2167
____do... .001767
....do.».	.164
......... 49.7
. 1".05 from neck ............silky
12.״ ,16.״ ,*37.״ ..
General summary.
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............................