114 PIVOT SOCKETS-15-POUNDER GUN MOUNTS. PIVOT SOCKETS, 16-POUNDER GUN MOUNTS, STEEL CASTINGS. Elongation of inch sections. " // .20*, .19 .21, .24* .15, .18* .12*, .08 .11*, .10 .15, .17* .08*, .07 .15*, .14 .14, .17* .15, .17* .18, .17* .11*, .10 .10*, .08 .04, .06* .18*, .17 .17, .25* .19, .24* Appearance of fracture. Granular 85 per cent, silky 15 per cent........ Granular 60 per cent, silky 40 per cent........ Granular, silky spot at circumference...'...... Granular, silvery luster, silky spot at circumference. Granular 80 per cent, silky 20 per cent........ Granular, silky spot at circumference.......... Granular, silvery luster, silky spot at circumference. Granular, silky spot at circumference.......... Medium, coarse, granular; brilliant facets..... Granular, silk spot at circumference........... Granular 80 per cent, silky 20 per cent...... Granular, silvery luster....................... ___do.......................................... Granular 60 per cent, dull silky 40 per cent... Granular, silky spot at circumference.......... Dull gray, amorphous........................... Granular, silky spot at circumference.......... No. of test. Marks on specimen. Diame- ter. 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. Per cent. 7224 A 92 \ 2 P S 15 J .505 .20 27,000 73,500 19.5 20.5 7225 A127 1 2 P S 15 / . 505 .20 28,000 72,500 22.5 23.9 7230 A137 1 PS 15 J .505 .20 29,000 69,900 16.5 16.9 7331 A138 1 P S 15 J .505 .20 22,000 62,650 10.0 13.2 7232 A140 1 \ 2 P S 15 / .505 .20 29,000 64,850 10.5 13.2 7233 1 A 152 1 P S 15 / .505 .20 33,000 69,950 16.0 16.9 7234 Í A 153 Ì 1 PS 15 J .505 .20 20,000 58,400 7.5 9.5 7235 J A154 Ì \ P S 15 ( .505 .20 30,000 71,000 14.-5 16.9 7274 Í A 155 \ \ P S 15 J .505 .20 19,000 58,550 15.5 16.9 7236 Í A 156 1 \ PS 15 J .505 .20 30,000 70,950 16.0 16.9 7331 Í A 158 \ \ P S 15 j .505 .20 33,000 76,900 15.0 16.9 7336 Г A 159 Ì i P S 15 J .505 .20 19,000 60,900 10.5 13.2 7337 J A 160 \ P S 15 J .505 .20 19,000 59,950 9.0 9.5 7338 f A 161 Ì i P S 15 J .505 .20 24,000 56,500 5.0 9.5 7339 f A165 \ 1 P S 15 J .505 .20 23,000 66,500 17.5 20.5 7346 / A 125 \ i 2 P S 15 .505 .20 29,000 61,850 21.0 27.4 7347 f A 150 \ 2 PS 15 .505 .20 29,000 70,100 21.5 23.9