29
6-INCH R. F. GUNS.
Jacket.
No. 7316.
Marks, bt2 m Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
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.	Initial load.
5,000	.000100	.000100	0.	0.	
10,000	.000267	.000167			
20,000	.000600	.000333			
30,000	.000933	.000333			
40,000	.001300	.000367	0.	0.	
46,000	.001533	.000233	0.	0.	
50,000	.001667	.000134			
53,000	.001767	.000100			
54,000	. 001833	. 000066			
55', 000	.001900	.000067			Elastic limit.
56.000	.006500	.004600			
57,000	. 006733	.000233			
58,000	.007667	.000934			
59;000	.008333	. 000666			
60'000	.009333	. 001000			
94;000					Tensile strength.
General summary.
Tensile strength per square inch of original section...........................pounds.. 94,000
Elastic limit per square inch of original section................................do... 55,000
Elongation per inch after rupture..............................................inch..	. 2233
Elongation per inch under strain at elastic limit................................do... . 001900
Reduction in diameter at point of rupture........................................do...	.164
Reduction in area after rupture, per cent of original section......................... 49.7
Position of rupture............................................................ 1".62 from neck
Character of broken surface..............................................................silky
Elongation of inch sections.................................................... ".14, ".38*, 15.״