131
PIVOT YOKES---15-POUNDER GUN MOUNTS.
No. 7348.
Marks, |y7i5 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	Inch. 0. .00010 .00035	Inch. 0. .00010 .00025	Inch. 0. 0.	Inch. 0. 0.	Initial load.
20,000	.00060	.00025			
30,000	.00100	.00040			
34,000	.00130	.00030			Elastic limit.
35,000	.00800	. 00670			
36,000	.00900	. 00100			
37,000	.01000	. 00100			
38,000	.01100	.00100			
39,000	.01150	.00050			
78,600					rp •1 .
			1		
........................pounds..	78,600
■..........................do...	34,000
..........................inch..	.2300
•..........................do...	.00130
...........................do...	.075
................................ 27.4
......,־••־־־.........15"1  from neck
granular 50 per cent, silky 50 per cent ............................ ".25*,".21
General summary.
Tensiie 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 orig’inai section ’ Position of rupture................
Character of broken surface............................
Elongation of inch sections........ ...................
No. 7321.
Marks, |y8!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	Inch. 0. .00015 .00035	Inch. 0. .00015 . 00020	Inch. 0. 0.	Inch. 0. 0.	Initial load.
20,000	.00070	.00035			
30,000	. 00115	. 00045			
31,000	.00120	. 00005			
32,000	.00130	.00010			
33,000	. 00135	. 00005			Elastic limit.
34,000	. 00270	. 00135			
35,000	. 00630	. 00360			
36,000	. 00700	. 00070			
37,000	.00775	. 00075			
38,000	.00865	. 00090			
70,400					
				1	
........................pounds..	70,400
...........................do...	33,000
.........................incSi..	.0700
...........................do...	.00135
...........................do...	.025
................................ 9.5
.......................30.״ from neck
granular 70 per cent, silky 30 per cent ............................".11*, ".03
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...........V.’.V.’.’.V.’.’.V.V,................
Elongation of inch sections.............. . . . . . . . . . . . . . . . ..