OUTER BASES---15-POUNDER GUN MOUNTS.
170
No. 7243.
Marks, OB 15 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Successive permanent set.
Permanent set.
Inch.
0.
0.
Inch.
0.
0.
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.
Pounds.	Inch.	Inch.
1,000	0.	0.
5,000	.00010	.00010
10,000	.00025	.00015
20,000	. 00060	. 00035
25,000	.00085	.00025
27,000	.00095	.00010
28.000	.00100	.00005
29,000	.00110	. 00010
30,000	.00235	. 00125
31,000	.00475	.00240
32,000	.00570	.00095
33,000	.00640	. 00070
34,000 77,500	.00715	.00075
		
General summary.
......................pounds.. 77,500
..........................do... 29,000
.........................inch.. .1550
..........................do... .00110
..........................do...	.045
............................... 16.9
...................... 66.״ from neck
granular, silkv spot at circumference
15.״ ,*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 ............................
Elongation of inch sections ............................
No. 7244.
Marks, o b5is 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 32.000 33.000 34.000 35.000 36.000 37.000 80,600	Inch. 0. .00005 .00015 .00055 .00100 .00105 .00450 .00600 .00650 .00700 .00775	Inch. 0. . 00005 . 00010 . 00U40 . 00045 .00005 . 00345 .00150 .00050 .00050 .00075	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
.....................pounds.. 80,600
.........................do... 32,000
........................inch.. .1600
.........................do... .00105
.........................do...	.045
............................... 16.9
..................... ".48 from neck
granular 85 per cent, silky 15 per cent
*18.״ ,14.״ .........................
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, percent of original section
Position of rupture.....................................
Character of broken surface.............................
Elongation of inch sections.............................