145
INNEE BASES---15-POUNDEB GUN MOÜNTS.
No. 7209.
Marks, !1¿4!o Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Perm an p־nt Successive permanent permanent stt־ ! set.	Remarks.
Pounds. 1,000 5,000 10, 000 20,000 30,000	Inch. 0. .00010 . 00030	Inch. 0. .00010 .00020	Inch. \ Inch. 0. 0. 0. 0.	Initial load.
	.00060	. 00030		
	.00100	.00040		
31,000	. 00105	.00005		Elastic limit.
32,000	.00915	.00810		
33.000 34.000	. 00995	.00080		
	. 01100	.00105		
35, 000	.01190	.00090		
36, 000	. 01300	.00110		
70,300				Tensile strength.
				
General summary.
.....................pounds.. 70,300
.........................do... 31,000
........................inch.. .2150
.........................do... .00105
.........................do...	.055
.............................. 20.5
..................... ".95 from neck
granular, silky spot at circumference
20.״ ,*23.״ .........................
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.............................r.......
Character of broken surface.............................
Elongation of inch sections.............................
No. 7210.
Marks, ib!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 20,000 30.000 32.000 33.000 34.000 35.000 36, 000 37.000 69,800	Inch. 0. . 00005 . 00025 . 00060 . 00100 . 00110 . 01015 .01140 .01200 . 01315 .01525	Inch. 0. . 00005 .00020 .00035 . 00040 .00010 .00905 . 00125 .00060 .00115 .ookio	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
.....................pounds.. 69,800
.........................do... 32,000
........................inch.. .2050
.........................do... .00110
.........................do...	.055
............................. 20.5
...................... ".7 from neck
granular, silky spot at circumference
*22.״ ,19.״.........................
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----10