35
7-INCH B. X,. SIEGE HOWITZERS,
Jacket.
No. 7251.	#
Marks, b7'״J 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.	
5,000	.000067	.000067	0.	0.	
10,000	.000267	.000200			
20,000	.000600	.000333			
30,000	.000967	.000367			
40,000	.001333	.000366	0.	0.	
46,000	.001600	.000267	0.	0.	
48.000	.001700	.000100			
49,000	.001700	0.			
50,000	. 001767	.000067			
51,000	.001800	.000033			
52,000	.002000	. 000200			
53,000	.002433	.000433			
54,000	.002867	. 000434			
55,000	. 003600	.000733			
56,000	.005000	.001400			
57,000	.006000	. 001000			
90,400					Tensile strength.
.pounds.. 90,400
----do... 51,000
.inches.. .2100 ....do... .001800
----do...	.164
......... 49.7
1 ".30 from neck
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.........................* . . ’