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OUTER BASES---lô-POUNDER GUN MOUNTS.
No. 7340.
Marks, o b 15 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 25.000 26.000 27.000 28.000 29.000 30.000 66,850	Inoli. 0. .00010 .00040 .00085 .00115 .00140 .00260 .00400 .00600 .00710	Inch. 0. .00010 .00030 .00045 .00030 . 00025 . 00120 .. 00140 .00200 .00110	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
		1			
.....................pounds..	66,850
........................do...	25,000
.......................inch..	.2200
........................do...	.00115
......................  do...	.065
............................. 23.9
.................... 1". 10 from neck
granular, silky spot at circumference .......................... ".22, ".22*•
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............................
No. 7320.
Marks, ob 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	Inch. 0. .00010	Inch. 0. .00010	Inch. 0.	Inch. 0.	Initial load.
10,000 20,000 30.000 31.000 32.000 33.000	.00025	.00015			
	.00065	.00040			
	. 00105	.00040			
	.00110	. 00005			Elastic limit.
	.00125	.00015			
	.00550	.00425			
34.000 35.000	. 00600	.00050			
	.00680	.00080			
36,000	.00760	.00080			
37,000	.00825	.00065			
77,450			•		Tensile strength.
	1				
General summary.
......................pounds.. 77,450
..........................do... 31,000
.........................inch.. .1850
..........................do... .00110
..........................do...	.065
............................... 23.9
........................ 1" from neck
granular 80 per cent, silky 20 per cent
17.״ ,*20.״ ..........................
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•
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