153
INNEE BASES-—15-POUNDEK GUN MOUNTS.
No. 7282.
Marks, ibis Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	1 Permanent | set.	Successive permanent set.	Remarks.
Pounds.	Inch.	Inch.	! Inch.		
1,000	0.	0.	\ 0•	0.	Initial load.
5,000	.00010	.00010	i 0.	0.	
10,000	.00030	.00020			
20,000	. 00060	.00030			
30,000	. 00095	.00035			
37,000	.00140	.00045			Elastic limit.
38,000	.00805	.00665			
39,000	. 00900	.00095			
40,000	. 00955	.00055			
41,000	.01050	.00095			
42,000	.OHIO	. 00060			
79,800					
					
......................pounds.. 79,800׳
..........................do... 37,000
.........................inch.. .1800
..........................do... .00140
..........................do...	.055
............................... 20.5
........................ 1" from neck
granular 60 per cent, silky 40 per cent
16.״,*20." ...........................
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. 7299.
Marks, bfis 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.	Inch.	Inch.	Inch.		
1,000	0.	0.	0.	0.	
5,000	.00010	.00010	0.	0.	
10,000	.00020	.00010			
20,000	.00055	.00035			
25,000	.00080	.00025			
28,000	. 00095	. 00015			
29,000	. 00100	. 00005			Elastic limit.
30,000	1 . 00105	.00005			
	\ .00715	.00610			
31,000	. 00750	. 00035			
32,000	.00820	. 00070			
33,000	.00910	.00090			
34,000	. 01000	. 00090			
35,000	. 01100	. 00100			
69,500					Tensile strength.
General summary.
.....................pounds.. 69,500
.........................do... 29,000
........................inch.. .1450
.........................do... .00100
.........................do...	.055
.............................. 20.5
..................... l."06 from neck
granular, silky spot at circumference
״15.״ ,*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, per cent of original section.
Position of rupture...........>.........................
Character of broken surface.......................
Elongation of inch sections............................. . . .