Part 279

XI.—Copper, 65 parts; zinc, 35 parts.

XII.—Copper, 70 parts; zinc, 30 parts.

XIII.—German Brass.—Copper, 1 pound; zinc, 1 pound.

XIV.—Watchmakers’ Brass.—Copper, 1 part; zinc, 2 parts.

XV.—Brass for Wire.—Copper, 34 parts; calamine, 56 parts.

XVI.—Brass for Tubes.—Copper, 2 parts; zinc, 1 part.

XVII.—Brass for Heavy Work.—Copper, 100 parts; tin, 15 parts; zinc, 15 parts.

XVIII.—Copper, 112 parts; tin, 13 parts; zinc, 1 part.

XIX.—Tombac or Red Brass.—Copper, 8 parts; zinc, 1 part.

XX.—Brass.—Copper, 3 parts; melt, then add zinc, 1 part.

XXI.—Buttonmakers’ Fine Brass.—Brass, 8 parts; zinc, 5 parts.

XXII.—Buttonmakers’ Common Brass.—Button brass, 6 parts; tin, 1 part; lead, 1 part. Mix.

XXIII.—Mallet’s Brass.—Copper, 25.4 parts; zinc, 74.6 parts. Used to preserve iron from oxidizing.

XXIV.—Best Brass for Clocks.—Rose copper, 85 parts; zinc, 14 parts; lead, 1 part.

«GOLD ALLOYS:»

See also Gold Alloys, under Alloys.

Gold of 22 carats fine being so little used is intentionally omitted.

I.—Gold of 18 Carats, Yellow Tint.—Gold, 15 pennyweights; silver, 2 pennyweights, 18 grains; copper, 2 pennyweights, 6 grains.

II.—Gold of 18 Carats, Red Tint.—Gold, 15 pennyweights; silver, 1 pennyweight, 18 grains; copper, 3 pennyweights, 6 grains.

III.—Spring Gold of 16 Carats.—Gold, 1 ounce, 16 pennyweights; silver, 6 pennyweights; copper, 12 pennyweights. This when drawn or rolled very hard makes springs little inferior to steel.

IV.—Jewelers’ Fine Gold, Yellow Tint, 16 Carats Nearly.—Gold, 1 ounce; silver, 7 pennyweights; copper, 5 pennyweights.

V.—Gold of Red Tint, 16 Carats.—Gold, 1 ounce; silver, 2 pennyweights; copper, 8 pennyweights.

Sterling Gold Alloys.—I.—Fine gold, 18 pennyweights, 12 grains; fine silver, 1 pennyweight; fine copper, 12 grains.

II.—Dry Colored Gold Alloys, 17 Carat.—Fine gold, 15 pennyweights; fine silver, 1 pennyweight, 10 grains; fine copper, 4 pennyweights, 17 grains.

III.—18 Carat.—Fine gold, 1 ounce; fine silver, 4 pennyweights, 10 grains; fine copper, 2 pennyweights, 5 grains.

IV.—18 Carat.—Fine gold, 15 pennyweights; fine silver, 2 pennyweights, 4 grains; fine copper, 2 pennyweights, 19 grains.

V.—18 Carat.—Fine gold, 18 pennyweights; fine silver, 2 pennyweights, 18 {436} grains; fine copper, 3 pennyweights, 18 grains.

VI.—19 Carat.—Fine gold, 1 ounce; fine silver, 2 pennyweights, 6 grains; fine copper, 3 pennyweights, 12 grains.