12-INCH STEEL В. L. RIFLED MORTARS.
60
Jacket.
No. 7306.
-\,r i 17796 B4
Marks, m To m Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
Remarks.
Successive
permanent
set.
Permanent
set.
Successive elongation per inch.
Elongation per inch.
Initial load.
Elastic limit.
Tensile strength.
Inch.
Inch.	Inch.
Inch.
0.	0.	0.
. 000067	0.	0.
.000266 ..................
. 000334	................
.000333	................
. 000133	0.	0.
. 000200 .................
. 000067	0.	0.
.000267	................
.000100 ..................
.011900	................
.000666 ..................
.001067	................
. 000933	................
.001067	................
0.
.000067 .000333 .000667 .001000 . 001133 .001333 .001400 .001667 .001767 .013667 .014333 .015400 .016333 .017400
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
35.000
40.000
42.000
50.000
53.000
54.000
55.000
56.000
57.000
58.000 88,960
pounds.. 88,960
____do... 53,000
...inch..	.2400
....do... .001767
....do...	.164
......... 49.7
.. 14.״ from neck ........... silky
19.״ ,*33." ,20.״ ..
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............................
I