INNEE BASES---15-POUNDEK GUN MOUNTS.
144
No. 7237.
Marks, 2^1 b is Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Remarks.
Successive elongation per inch.	Permanent set.	Successive permanent set.
Inch. 0. .00005 .00015 .00035 .00030 . 00010 .00035 . 00020 . 00050 . 00045 .00075 .00075 .00070	Inch. 0. 0.	Inch. 0. 0.
		
		
		
		
		
		
		
		
		
		
		
		
Elongation per inch.
Applied loads per square inch.
Elastic limit.
Tensile strength.
Inch.
0.
.00005 .00020 . 00055 . 00085 .00095 .00130 . 00150 . 00200 .00245 . 00320 . 00395 .00465
Pounds. 1,000 5,000 10,000 20,000
25.000
26.000
27.000
28.000
29.000
30.000
31.000
32.000
33.000 68,500
General summary.
Tensile strength per square inch of original section...........................pounds.. 68,500
Elastic limit per square inch of original section...............................do... 26,000
Elongation per inch after rupture................................................. inch.. . 1550
Elongation per inch under strain at elastic limit..............................do... . 00095
Reduction in diameter at point of rupture......................................do...	. 045
Reduction in area after rupture, per centum of original section...................... 16.9
Position of rupture............................................................ 1".08 from neck
Character of broken surface................granular, silvery luster 80 per cent, silky 20 per cent
Elongation of inch sections....................................................... "•15, "•16*
No. 7216.
Marks, r!3is 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 27.000 28.000 29.000 30.000 31.000 32.000 68,450	Inch. 0. .00010 . 00030 .00060 .00085 .00400 .00500 .00595 .00655 .00760	Inch. 0. . 00010 .00020 .00030 .00025 .00315 . 00100 .00095 .00060 .00105	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
.....................pounds.. 68,450
........................do... 27,000
.......................inch.. .2100
........................do... .00085
........................do...	.055
.............................. 20.5
...................... 1" from neck
:ranular 70 per cent, silky 30 per cent
*23.״ ,19.״ .........................
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............................