OUTER BASES---15-POUNDER GUN MOUNTS.
166
No. 7241.
Marks, ?ob 15 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Permanent set.	Successive permanent set.
Inch. 0. 0.	Inch. 0. 0.
	
	
	
	
	
	
	
	
	
	
	
.	
Successive elongation per inch.
Inch.
0.
.00010 . 00020 .00040 . 00020 .00010 . 00005 .00010 . 00080 .00055 .00090 .00110 .00100
Applied loads per square inch.	Elongation per inch.
Pounds.	Inch.
1,000	0.
5,000	. 00010
10,000	. 00030
20,000	.00070
25,000	.00090
27,000	.00100
28,000	. 00105
29,000	.00115
30,000	.00195
31,000	.00250
32,000	.00340
33,000	.00450
34,000	.00550
67,000	
General summary.
......................pounds.. 67,000
..........................do... 29,000
.........................inch.. .1650
..........................do... .00115
..........................do...	.045
................................ 16.9
...................... 60.״ from neck
granular, silkv spot at circumference
15 .״ ,*18 .״ .........................
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.............................
No. 7214.
Marks, o b is Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set	Successive permanent set¿	Remarks.
Pounds. ■ 1,000 5,000 10,000 20,000 30.000 31.000 32.000 33.000 34.000 35.000 71,500	Inch. 0. .00010 . 00030 .00060 .00105 .00545 . 00840 . 00925 .01015 .01095	Inch. 0. .00010 .00020 .00030 .00045 . 00440 . 00295 .00085 . 00090 .00080	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
General summary.
......................pounds.. 71,500
..........................do... 30,000
........................inch.. .2050
..........................do... .00105
..........................do...	.055
.............................. 20.5
....................... 9.״ from neck
granular 60 per cent, silky 40 per cent
*23.״ ,18.״ ..........................
Tensile strength per square inch 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.............................