27
6-INCH E. F. GUNS.
Jacket.
No. 7304.
Marks,
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	. 000033	.000033	0.	0.	
10,000	. 000267	.000234			
20,000	. 000633	.000366			
30,000	.000967	.000334			
40,000	.001300	.000333	0.	0.	
46.000	. 001533	.000233	0.	0.	
50,000	. 001700	.000167			
54,000	.001800	. 000100			Elastic limit.
55,000	. 001933	.000133			
56,000	.002167	.000234			
57,000	.004400	.002233			
58,000	.006000	.001600			
59,000	.006333	.000333			
95,680					Tensile strength.
General summary.
Tensile strength per square inch of original section...........................pounds..	95,680
Elastic limit per square inch of original section.................................do...	54,000
Elongation per inch after rupture................................................inch..	.2000
Elongation per inch under strain at elastic limit.................................do...	. 001800
Reduction in diameter at point of rupture.......................................do...	. 164
Reduction in area after rupture, per cent of original section......................... 49.7
Position of rupture ...............................•.־..........................95.״  from neck
Character of broken surface..............................................................silky
Elongation of inch sections..................................................... 36.״ ,14.״ ,10.״*