OU TEK BASES-15-POUNDEK GUN MOUNTS.	181
Tabulation.
OUTER BASES OF 15-POUNDER GUN 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.
7240	/ D 65 1 2 О В 15	Inches. . 505	Sq. inch. .20	Pounds. 22,000	Pounds. 63,400	Per cent. 20.5	Per cent. 23.9	• Granular 20 per cent, dull silky 80 per cent..	Inch. .21*, .20
7213	f D 67 1 О В 15	.505	.20	29,000	46,300	5.0	1.8	Dull gray amorphous in part and in part granular. Irregular surface	
7241	f D 67 1 2 0 В 15 /	.505	.20	29,000	67,000	16.5	16.9	Granular, silky spot at circumference		.18*, .15
7214	/ I) 68 1 1 О В 15 /	.505	.20	30,000	71,500	20.5	20.5	Granular 60 per cent, silky 40 per cent		.18, . 23* .17*, .13 .12*, .10 .16, . 18* .16*, .14 .17*, .17 .13*, .13 .16*, .15 .14, . 18*
7217	/ D 69 1 1 О В 15 /	.505	.20	32,000	74,400	15.0	16.9	Granular 85 per cent, silky 15 per cent...	
7218	1 D 70 1 О В 15 /	.505	.20	28,000	71,500	11.0	13.2		do	 %	
7269	/ D 70 1 1 20 В 15 /	.505	.20	30,000	76,500	17.0	16.9	Granular, silky spot at circumference		
7219	/ D 71 1 ] О В 15 /	.505	.20	30,000	73,450	15.0	16.9		do		
7220	1 D72 Ì 1 О В 15 /	.505	.20	28,000	72,000	17.0	16.9		do		
7242	J В 73 1 1 О В 15 f	.505	.20	29,000	69,450	13.0	16.9	Granular 50 per cent, silky 50 per cent	״	
7243	1 В 74 1 1 О В 15 /	.505	.20	29,000	77,500	15.5	16.9	Granular, silky spot at circumference		
7244	f D 75 1 1 О В 15 f	.505	.20	32,000	80,600	16.0	16.9	Granular 85 per cent, silkv 15 per cent		
7245	D76 1 О В 15 /	.505	.20	29,000	71,400	8.0	9.5	Granular, silky spot at circumference		
7270	í D76 1 \ 2 О В 15 /	.505	.20	32,000	72,000	18.5	23.9	Granular 60 per cent, silkv 40 per cent..	.20*, .17 .11, .17*
7247	f В 77 1 1 О В 15 /	.505	.20	34,000	78,600	14.0	20.5	Granular 40 per cent, silky 60 per cent	
7248	Г J) 78 1 1 О В 15 J	.505	.20	29,000	73,400	14.0	16.9	Granular 85 per cent, silkv 15 per cent		
7275	Í В 79 I. О В 15 /	.505	.20	31,000	72,600	14.0	16.9	Granular 60 per cent, silkv 40 per cent		
7288	D 80 1 О В 15 /	.505	.20	37,000	85,100	15.0	16.9	Granular 70 per cent, silkv 30 per cent		
7289	í D81 Ì О В 15 /	.505	.20	38,000	83,900	16.5	20.5		.15, . 1§*