PIVOT SOCKETS—15-POUNDER GUN MOUNTS.	113
No. 7347.
Marks, l/sV 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.	Inch.	Inch.	Inch.		
1,000	0.	0.	0.	0.	
5,000	.00010	.00010	0.	0.	
10,000	.00035	.00025			
20,000	.00080	.00045			
29,000	.00120	.00040			Elastic limit.
30,000	. 00145	. 00025			
31,000	.00170	.00025			
32,000	.00850	.00680			
33,000	. 01000	. 00150			
34,000	. 01100	.00100			
70,100					Tensile strength. (
General summary.
.....................pounds.. 70,100
.........................do... 29,000
.......................inch.. .2150
.........................do... .00120
.........................do...	.065
.............................. 23.9
..................... ".70 from neck
granular, silky spot at circumference
*24.״ ,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......................... i.....
H. Doc. 508----8