5-INCH B. L. SIEGE KIELES.	J7
Tube.
No. 7291.
Marks, If b».
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.	Inch.	
1,000	0.	0.	0.	0.	
5,000	.00010	.00010	0.	0.	
10,000	.00025	00015			
20,000	.00060	. 00035			
30,000	. 00100	. 00040			
35,000	.00115	. 00015	0.	0.	
40,000	. 00135	. 00020			
42,000	.00140	.00005	0.	0.	
47,000	.00155	.00015			Elastic limit.
48,000	. 00665	. 00510			
49,000	.00810	. 00145			
50,000	.00930	. 00120			
51,000	. 01005	. 00075			
52,000	. 01150	. 00145			
81,700					Tensile strength.
.pounds.. 81,700
----do... 47,000
...inch.. .2550
----do... .00155
----do...	.155
......... 51.9
. ". 85 from neck ..........silky
*38.״ ,13."......
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................
H. Doc. 508----------2