49
12-INCH steel b. l. rifles, J ACKET.
No. 7355.
Marks,
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.		
1,000	0.	0.	0.	0.	Initial load.
5,000	.000100	.000100	0.	0.	
10,000	.000333	.000233			
20,000	.000667	.000334			
30,000	. 001.000	. 000333			
35.000 40.000	.001167	.000167	0.	0.	
	.001367	.000200			
42,000	.001467	. 000100	0.	6.	
48,000	.001667	.000200			Elastic limit.
49,000	.003667	. 002000			
50,000	.004667	.001000			
51,000	.005400	. 000733			
52,000	. 006300	. 000900			
53,000	. 006667	.000367			
94,360					
					
pounds.. 94,360
----do... 4.3,000
...inch..	.2333
....do... .001667
----do...	.144
......... 44.6
... 1" from neck
........... silky
.. ".14, ".21, ".35*
General nummary.
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................'.......
H. Doc. 508----------4