155
INNEE BASES---15-POUNDER GUN MOUNTS,
No. 7310.
Marks, f¿0¿
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 74,900	Inch. 0. .00015 .00030 .00060 . 00105 .00110 . 00875 . 00900 .00925 . 01000 .01075	Inch. 0. .00015 .00015 . 00030 . 00045 . 00005 .00765 .00025 .00025 . 00075 .00075	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
■.....................pounds.. 74,900
..........................do...	32,000
........................inch.. .1700
..........................do...	.00110
..........................do___	.055
............................... 20.5
......................".58 from neck
granular 85 per cent, silky 15 per cent
*19.״ ,15.״ ..........................
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. 7311.
Marks, !!ns 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.	Inch.	
1,000	0.	0.	0.	0.	
5,000	.00015	.00015	0.	0.	
10,000	. 00030	.00015			
20,000	, 00065	.00035			
30,000	.00105	. 00040			
33,000	.00120	.00015			
34,000	.00125	.00005			Elastic limit.
35,000	.00770	.00645			
36,000	.00830	. 00060			
37,000	.00900	.00070			
38,000	.01000	.00100			
39,000	.01090	.00090			
76,550					Tensile strength.
General summary.
Tensile strength per square inch of original section.............. nounds 7fi 550
Elastic limit per square inch of original section....... ....................... do ” «u non
Elongation per inch after rupture.............................״״״”״״״...........'inch ”	1750
Elongation per inch under strain at elastic limit.................״”״״״'........ do " 00125
Reduction in diameter at point of rupture......................***.'.'״״.*......do" * ' 045
Reduction in area after rupture, per cent of original section	....................... i« ״
Position of rupture..................................... .......................9־ ־״V *f” mm ne;£
'¿¿«־silky 20 per cent
17, ". 18*