19
5־INCH B. L. SIEGE KIELES.
Jacket.
No. 7365.
Marks, B»3 Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
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.	*Initial load.
5,000	.000100	. 000100	0.	0.	
10,000	.000300	. 000200			
20,000	.000633	.000333			
30,000	.000967	.000334			
40,000	.001367	.000400			
46,000	.001567	. 000200	0.	0.	
50,000	.001733	.000166	0.	0.	
51,000	.001800	. 000067			
52,000	. 001900	.000100			
53,000	.002033	.000133			
54,000	.003367	.001334			
55,000	. 004667	.001300			
56,000	. 006033	.001366			
57,000	.006667	.000634			
58,000	..008000	.001333			
94,920					Tensile strength.
.pounds.. 94,920 not well defined
....inch.. .2200
.....do... .134
.......... 41.9
1". 6 from neck
General summary.
Tensile strength per square incn of original section.....
Elastic limit per square inch of original section........
Elongation per inch after rupture........................
Reduction in diameter at point of rupture................
Reduction in area after rupture, per centum of original section
Position of rupture......................................
Character of broken surface..............................
Elongation of inch sections..............................
TABULATION OF TENSION SPECIMENS FROM 5-INCH B. L. SIEGE RIFLES (STEMS OF SPECIMENS FROM TUBES, 2" LONG, ".505 DIAMETER) .
No. of test.	Position in gun.	Elastic limit per square inch.	Tensile strength per square inch.	Elon- gation.	Contraction of area.	Appearance of fracture.	Remarks.
7291 7323	Tube	 	do		Pounds. 47.000 45.000	Pounds. 81,700 84,450	Per ct. 25.5 22.0	Per cl. 51.9 46.2	Silky		Breech end. Do.
							
							
STEMS OF SPECIMENS FROM JACKETS, 3" LONG, ".564 DIAMETER.
7365 ! Jacket...	Not	94,920	22.0	41.9	Silky		Breech end.
	defined.