41
10-INCH STEEL B. L. RIFLES,
Jacket.
No. 7383.
Mai ks, b t2 m 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.	
5,000	.000100	. 000100	0.	0.	
10,000	.000300	. 000200			
20,000	. 000633	. 000333			
30,000	.000967	.000334			
35,000	.001133	.000166	0.	0.	
40,000	.001300	.000167			
42,000	.001367	.000067	0.	0.	
50,000	.001633	.000266			
53,000	.001767	.000134			Elastic limit.
54,000	.004000	. 002233			
55,000	.005000	.001000			
56,000	.005833	. 000833			
57,OOo	.006667	.000834			
58,000	.007333	.000666			
96,720					Tensile strength.
pounds.. 96,720
....do... 53,000
...inch..	.2000
....do... .001767
----do...	.144
......... 44.6
. 1".4 from neck ........... silky
15.״ ,*29.״ ,16." ..
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...............................
TABULATION OF TENSION SPECIMENS FROM 10-INCH B. L. RIFLES.
STEMS OF SPECIMENS, 3״ LONG, 564.״ 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.
7404	Tube		Middle .	Pounds. 50,000	Pounds. 84,960	Per ct. 23.7	Per et. 49.7	Silky		
7372	Jacket...	—do...	50,000	90,360	19.3	33.5	Fine granular, 50	Breech end.
7383	—do			53,000	96,720	20.0	44.6	per cent; silky, 50 cent. Silky		Do.