INNER BASES---15-POUNDER GUN MOUNTS.
156
No. 7312.
Marks, i'b°!5 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	Inch. 0. .00015 . 00030	Inch. 0. .00015 . 00015	Inch. 0. 0.	Inch. 0. 0.	Initial load.
20,000	.00065	. 00035			
30,000	. 00105	. 00040			
34,000	.00120	.00015			
35,000	. 00130	.00010			Elastic limit.
36,000	. 00900	.00770			
37,0 J)	.00950	.00050			
38,000	. 01000	.00050			
39,000	.01075	.00075			
40,000	. 01170	. 00095			
75,500					Tensile strength.
					
General summary.
Tensile strength per square inch of original section...........................pounds.. 75,500
Elastic limit per square inch of original section................................do. 35,000
Elongation per inch after rupture..............................................inch.. . 1350
Elongation per inch under strain at elastic limit..............................do... . 00130
Reduction in diameter at point of rupture........................................da...	.045
Reduction in area after rupture, per cent of original section.............!........... 16.9
Position of rupture............................................................ 60.״ from neck
Character of broken surface..........................granular 60 per cent, dull silky 40 per cent
Elongation of inch sections...................................................... 12, 15 .״*
No. 7313.
Marks, ib!5 Diameter, ".505.
Sectional area, . 20 square inch. Gauged length, 2". •
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.
Pounds. 1,000 5,000 10,000 20,000 25.000 28.000 29.000 30.000 31.000 32.000 33.000 34.000 62,850	Inch. 0. .00015 .00030 .00070 . 00095 . 00110 .00115 . 00590 . 00650 .00750 .00825 . 00900	Inch. 0. .00015 .00015 .00040 .00025 .00015 . 00005 .00475 . 00060 .00100 .00075 .00075	Inch. 0. 0.	Inch. 0. 0.
				
				
				
				
				
				
				
				
				
				
			1	
General summary.
......................pounds.. 62,850־
.........................do... 29,000
.........................inch.. .0550
.........................do... .00115
.........................do...	.025
............................... 9.5
...................... 76.״ from neck
granular 85 per cent, silky 15 per cent
*06." ,05.״ ..........................
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.............................