182	OUTER BASES-15-POUNDER GUN MOUNTS
Elongation of inch sections.
Inch.
.17*,	.14
.15*,	.13
.07,	.08*
.16*,	.14
.20*,	.21
.22,	.22*
. 20*,	.17
.16*,	.17
.18*,	.17
.19*,	.19
.24*,	.21
.20,	.26*
.15*,	.14
Tabulation—Continued.
OUTER BASES OF 15-POUNDER GUN MOUNTS, STEEL CASTINGS— Continued.
Appearance of fracture.
Granular 70 per cent, silky 30 per cent.
Granular 80 per cent, dull silky 20 per cent
Granular, silky spot at circumference.
Granular 85 per cent, silky 15 per cent.
Granular 40 per cent, silky 60 per cent.
Granular, silky spot at circumference...
Granular 80 per cent, silky 20 per cent.
Granular, silky spot at circumference...
Granular 80 per cent, silky 20 per cent.
Granular 60 per cent, silky 40 per cent.
Granular 40 per cent, silky 60 per cent.
Granular 30 per cent, silky 70 per cent.
Granular, silky spot at circumference...
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.
		Inches.	Sq. inch.	Pounds.	Pounds.	Per cent.	Percent.
7290	i D 82 1־ \ O B 15 f	.505	.20	36,000	81,500	15.5	16.9
7307	f D 83 1 1 OB 15 /	.505	.20	36,000	79,000	14.0	16.9
7332	f D 84 1 O B 15	.505	.20	32,000	80,350	7.5	9.5
7333	f D 85 1 OB15 /	.505	.20	29,000	74,900	15.0	16.9
7334	f D 86 1 \ O B 15 /	.505	.20	35,000	72,500	20.5	23.9
7340	f D87 \ 1 0‘B 15 /	.505	.20	25,000	66,850	22.0	23.9
7320	} D 88 \ 1 O B 15 /	.505	.20	31,000	77,450	18.5	23.9
7328	J D 89 1 t OB 15 1	.505	.20	38,000	81,500	16.5	16.9
7329	/ D 90 \ i O B 15 f	.505	.20	37,000	77,450	17.5	16.9
7330	i D9! \ OBIS j	.505	.20	32,000	70,450	19.0	20.5
7341	i D 92 \ OBIS /	.505	.20	39,000	79,900	22.5	27.4
7358	J D 93 1 1 O B 15 /	.505	.20	35,000	73,900	23.0	30.7
7359	/ D 94 \ \ O B 15 J	.505	.20	39,000	86,000	14.5	16.9