175
OUTER BASES---15-POUNDER GUN MOUNTS.
No. 7307.
Marks, o b 15 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
j 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	.00025	.00010			
20,000	.00065	.00040			
30,000	.00105	.00010			
35,000	.00125	.00020			
36,000	.00130	. 00005			Elastic limit.
37,000	.00815	.00685			
38,000	. 00880	.00065			
39,000	.00950	.00070			
40,000	.01040	.00090			
41,000	.01125	.00085			
79,000					Tensile strength.
General summary.
Tensile strength per square inch of original section..................... ־nounds 7Q nno
Elastic limit per square inch of original section....... 1 do	־■ifi’nnn-
Elongation per inch after rupture................ ..................................inoii''	1400•
Elongation per inch under strain of elastic limit....... ........................... do " nn־m
Reduction in diameter at point of rupture...........................................do* *’ ' 04?
Reduction in area after rupture, per centum of original section	................... k
Position of rupture..................................... ...........................״V- i:¿־ ־"¡;£
13.״ ,*15.
No. 7332.
Marks, o bis Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive i 0 elongation ^11׳^anent per inch. se1.		Successive permanent set.	Remarks.
Pounds.	Inch.	Inch.	Inch.	Inch.	
1,000	0.	0.	0.	0.	Initial load.
5,000	.00010	.00010	0.	0.	
10,000	. 00025	.00015			
20.000	.00065	.00040			
30,000	.00105	.00040			
31,000	.00110	. 00005			
32,000	.00115	. 00005			Elastic limit.
33,000	.00200	.00085			
34,000	.00400	.00200			
• 35,000	.00525	.00125			
36,000	.00600	.00075			
37,000	. 00660	.00060			
80,350 '					
					
.....................pounds.. 80,350
■........................do... 32,000
........................inch.. .075
.........................do... .00115
.........................do...	.025
.............................. 9.5
...................... 95.״ from neck
granular, silky spot at circumference
*08.״ ,07.״ ......-■..................
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....................7.7.7..
Elongation of inch sections...........................7.7