OUTER 3 ASES—-15-POUNDER GUN MOUNTS,
172
No. 7217.
.505.׳
Marks, o b 15
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 33.000 34.000 35.000 36.000 37.000 38.000 39.000 78,600	Inch. 0. .00015 .00030 .00065 .00105 .00115 .00120 .00650 . 00700 .00775 . 00850 .00925	Inch. 0. .00015 .00015 .00035 . 00040 .00010 . 00005 . 00530 .00050 .00075 . 00075 .00075	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
						
					
pounds.. 78,600 ....do... 34,000 ...inch.. .1400 ....do... .00120
____do...	.055•
......... 20.5
. ".30 from neck
silky 60 per cent, granular 40 per cent
*17.״ ,11.״..........................
General summary.
Tensile strength per square inch of original section.....
Elastic limit per square inch of original section —......
Elongation per inch after rupture........	— y.........
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. 7248. Marks, ob 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 25.000 28.000 29.000 30.000 31.000 32.000 33.000 34.000 73,400	Inch. 0. .00010 .00030 .00070 .00090 .00105 .00110 .00555 . 00620 . 00700 .00770 . 00845	Inch. 0. .00010 .00020 .00040 .00020 .00015 .00005 .00445 .00065 .00080 .00070 .00075	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
					
.pounds.. 73,400-
....do... 29,000
___inch.. .1400
....do... .00110
....do...	.045-
.......... 16.9
. ".55 from neck silky 15 per cent• ......".15*, ".13
granular 85 per cent,
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..............................
Elongation of inch sections..............................