VII.—Steel, 90; nickel, 10.
VIII.—Platinum, 60; copper, 40.
IX.—Platinum, 45; steel, 55.
X.—Platinum, 55; iron, 45.
XI.—Platinum, 15; steel, 85.
XII.—Platinum, 20; copper, 79; arsenic, 1.
XIII.—Platinum, 62; iron, 28; gold, 10.
XIV.—Gold, 48; zinc, 52.
XV.—Steel, 50; rhodium, 50.
XVI.—Platinum, 12; iridium, 88.