-INCH B. L. SIEGE HOWITZERS.
36
Jacket.
No. 7378.
Marks 06b!”
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.
	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	.001300	.000333	0.	Ó.	
46,000	. 001500	.000200	0.	0.	
50,000	. 001667	. 000167			
60,000					
					Elastic limit.
65,000	. 002300	.000167			»
66,000	. 002500	. 000200			
67,000	. 002700	.000200			
68,000	. 004333	.001633			
69,000	. 005667	.001334			
70,000 103,560	. 008000	. 002333			Tensile strength.
General summary.
,pounds.. 103,560
....do... 64,000
..inches.. .1767
....do... .002133
....do...	.144
......... 44.6
. 1". 27 from neck
............silky
.. ".10, ".26*, ".17
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............................
TABULATION OF TENSION SPECIMENS FROM 7-INCH B. L. SIEGE
HOWITZERS.
STEMS OP SPECIMENS FROM TUBES, 2" LONG. ".505 DIAMETER.
No. of test.	Position in gun.	Elastic limit, per square inch.	Tensile strength, per square inch.	Elonga- tion.	Contraction of area.	Appearance of fracture.	Remarks.
7322 7379	Tube	 	do		Pounds. 54.000 49.000	Pounds. 87,400 84,450	Per cent. 25.0 27.5	Per cent. 54.6 51.9	Silky, oblique	 Fine silky		Breech end. Do.
STEMS OP SPECIMENS FROM JACKETS, 3" LONG, ".505 DIAMETER.
7251		51,000	90,400	21.0	49.7	Silky		Breech end.
7378		do —	64,000	103,560	17.7	44.6