6-INCH E, F, GUNS.
30
Jacket.
No. 7353.
.25 smifl.rp, inoli
18388 Bo
Marks, BToM Diameter, ".564.
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	.000667	.000367			
30,000	.001033 •	.000366			
40,000	.001367	.000334			
46,000	. 001600	.000233	.000033	.000033	
50,000	.001700	.000100			
53,000	.001867	.000167			Elastic limit.
54,000	.003267	.001400			
55,000	.006333	.003066			
56,000	. 008500	.002167			
57,000	.009333	.000833			
58,000	. 010667	.001334			
89,120					Tensile strength.
General summary.
.........pounds..	89,120
............do...	53,000
...........inch..	.1967
............do...	.001867
............do...	.164
................. 49.7
at the middle of the stem ...................silky
.........".10, ".83*, ".16
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......................7.7.7. V
Elongation of inch sections.............................
TABULATION OF TENSION SPECIMENS FROM 6-INCII R. F. GUNS.
STEMS OF SPECIMENS FROM TUBES 2" LONG, ".505 DIAMETER.
No. of test.	Position in gun.	Location of specimens.	Elastic limit per square inch.	Tensile strength per square inch.	Elon- ga- tion.	Con- trac- tion of area.	Appearance of fracture.	Remarks.
7292 7296 7297 7352	Tube .... —do	 — do	 —do —	Middle . —do... —do... —do...	Pounds. 44.000 49.000 48.000 42.000	Pounds. 87.400 91.000 87.000 80.400	Per ct. 21.0 21.5 23.5 25.5	Per ct. 30.7 37.1 51.9 57.0	Silky, oblique	 Silky, trace of granulation. Silkv	 Silky, serrated		Breech end. Muzzle end. Breech end. Muzzle end.
STEMS OF SPECIMENS FROM JACKETS 3" LONG, 664.״ DIAMETER.
7304	Jacket...	Outside.	54,000	95,680	20.0	49.7	Silky		
7305		do			55.000 55.000	101,600 94,000	18.3	47.2		Do.
7316		do		Middle .			22.3	49.7		do		
7353	— do			do...	53,000	89,120	19.7	49.7		do		Do.