INNEB BASES-----15-POUNDEB GUN MOUNTS.	143
No. 7257.
Marks, sib 15 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 31.000 32.000 33.000 34.000 35.000 36.000 72,300	Inch. 0. .00010 .00025 . 00060 . 00105 . 001*15 .00890 .00940 .00990 .01075 .01205	Inch. 0. .00010 .00015 .00035 .00045 . 00010 . 00775 .00050 .00050 .00085 .00130	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
72,300 31,000 .1900 .00115 .055 20.5
Position of rupture.......................................................... 95.״ from neck
Character of broken surface...................granular 50 per cent, dull amorphous 50 per cent
Elongation of inch sections.......................................................17 ,",*21 .״
Tensile strength per square inch of original section...........................pounds..
Elastic limit per square inch of original section.................................do...
Elongation per inch after rupture................................................inch..
Elongation per inch under strain at elastic limit.................................do...
Reduction in diameter at point of rupture.........................................do...
Reduction in area after rupture, per cent of original section
No. 7215.
Marks, ib2i5 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 31.000 32.000 33.000 34.000 35.000 73,200	Inch. 0. .00010 . 00030 .00060 .00100 . 00615 . 00705 .00765 .00860 .00950	Inch. 0. .00010 .00020 .00030 .00040 .00515 .00090 .00060 .00095 .00090	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
General summary.
.....................pounds..	73,200
........................do...	30,000
.......................inch..	.1700
........................do...	.00100
........................do...	.045
............................. 16.9
..................... 9.״ from neck
granular, silky spot at circumference .........................."18* ".16
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............................