133
PIVOT YOKES---15-POUWDEE GUN MOUNTS.
7302.
No.
Marks, PY15 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 39.000 40.000 41.000 42.000 43.000 44.000 45.000 84,450	Inch. 0. .00010 . 00030 .00060 .00100 .00135 .00140 .00210 .00325 .00575 .00630 .00700	Inch. 0. .00010 . 00020 . 00030 .00040 .00035 .00005 .00070 .00115 .00250 .00055 .00070	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
					
General summary.
Tensile strength per square inch of original section...........................pounds.. 84 450
Elastic limit per square inch of original section..............................do... 10000 ׳
Elongation per inch after rupture..............................................inch!! . 0550
Elongation per inch under strain at elastic limit..............................! .do. . 00140
Reduction in diameter at point of rupture......................................do...	. 025
Reduction in area after rupture, per cent of original section.................... . . ... ] ’ ’	* 9.5
Position of rupture............................................................//.90 'from, neck
Character of broken surface..granular, silky spot at circumference containing hole 09.״ diameter
Elongation of inch sections...................................................... //.05, ״.oe*
No. '7349.
Marks, p y\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	Inch. 0. .00010 .00030	Inch. 0. .00010 .00020	Inch. 0. 0.	Inch. 0. 0.	Initial load.
	.00065	.00035			
24.000 25.000	. 00090	.00025			
	.00095	.00005			Elastic limit.
26,000	.00120	. 00025			
27.000 28.000 29,000	.00150	.00030			
	.00200	. 00050			
	. 00255	.00055			
30.000 31.000	. 00355	. 00100			
	. 00420	. 00065			
32,000 71,400	.00490	.00070			
					Tensile strength.
					
General summary.
Tensile strength per square inch of original section...........................pounds.. 71,400
Elastic limit per square inch of original section................................do. 25000 ׳
Elongation per inch after rupture..............................................inch.. . i500
Elongation per inch under strain at elastic limit.............................. do. . 00095
Reduction in diameter at point of rupture......................................!do...	. 035
Reduction in area after rupture, per cent of original section........... .............. 13 2
Position of rupture............................................................ i״.l3׳ from neck
Character of broken surface.......... medium, coarse, granular; dull silky spot at circumference
Elongation of inch sections...................................................... ".17*, 13.״