INNEE BASES--15-POUNDEE G UN MOUNTS.	161
Tabulation.
INNER BASES OF15-P0ÜNDER G UN MOUNTS, STEEL CASTINGS.
No. of test.	Marks on specimen.	Diam- eter.	Sectional area.	Elastic limit per square inch.	Tensile strength per square inch.	Elongation in 2 inches.	Contraction of area.	Appearance of fracture.	Elongation of inch sections.
7257		Inch.	Sq. in.	Pounds.	Pounds.	Per cent.	Per cent.		
	{ 3 I B 15 }	.505	.20	31,000	72,300	19.0	20.5	Granular 50 per cent, dull amorphous 50 per cent		.21*, .17
7215	/ A 82 1 1 I B 15 f	.505	.20	30,000	73,200	17.0	16.9	Granular, silky spot at circumference		
7237	Í A 82 1 t '2 I B 15 j	.505	.20	26,000	68,500	15.5	16.9	Granular, silvery luster 80 per cent, silkv 20 per cent		
7216	Í A 83 1 1 I B 15 /	.505	.20	27,000	68,450	21.0	20.5	Granular 70 per cent, silky 30 per cent		. 19, .22* .23*, .20 . 19, . 22*
7209	/ A 84 1 t IB 15 J	.505	.20	31,000	70,300	21.5	20.5	Granular, silkv spot at circumference		
7210	Í A 85 \ 1 I B 15 /	. 505	.20	32,000	69,800	20.5	20.5		do		
7211	J A 86 1 t I B 15 J	.505	.20	30,000	70,450	15.0	16.9		do		
7238	J A 86 \ t 2 I B 15 /	.505	.20	23,000	66,850	19.5	20.5		do		.17, . 22* .18*, .15 .13, .15*
7221	J A 87 1 \ I B 15 f	. 505	.20	33,000	73,950	16.5	16.9	Granular 80 per cent, silkv 20 per cent		
7222	Í A 88 \ t I B 15 /	.505	.20	30.000	74,500	14.0	16.9	Granular, silky spot at circumference		
7258	1 A 88 \ t 2 I B 15 /	.505	.20	34,000	73,550	21.5	23.9	Granular 30 per cent, dull amorphous 70 per cent		
7223	1 A 89 1 \ I B 15 /	.505	.20	24,000	57,400	21.0	27.4	Silky, trace of granulation		.15, .27* .17*, .15 . 15, . 19* .13*, .12 .23*, .17
7259	1 A 89 1 1 2 1 B 15 f	.505	.20	33,000	74,800	16.0	16.9	Granular, silky spot at circumference		
7239	î A 90 1 t I B 35 f	. 505	.20	34,000	73,100	17.0	20.5	Granular 85 per cent, silky 15 per cent...	
7253	I A 91 1 1 I B 15 t	.505	.20	35,000	77,600	12.5	13.2	Granular, silky spot at circumference		
7254	1 A 92 \ \ I B 15 /	.505	.20	30,000	71,300	20.0	‘>3.9	Granular 60 per cent, silkv 40 per cent...	
7260	A 93 1 t IB 15 Ì	.505	.20	28,000	78,500	12.5	16.9	Granular, silky spot at circumference...	
7261	A 94 1 I B 15 /	. 505	.20	29,000	77,800	15.5	16.9		do		. 15, . 16* .18*, .14
7280	! ¡ПП5 }	.505	.20	32,000	74,100	16.0	16.9	Granular 80 per cent, silky 20 per cent		
H. Doc. 508