Take of gold, 3 parts; silver, 3 parts; copper, 1 part; zinc, 1/2 part. 149. GOLD SOLDER No. 3 Take of gold, 2 parts; silver, 3 parts; copper, 1 part; and zinc 1/2 a part. The gold, silver, and copper must be fused in a crucible before the zinc is added, or else you cannot keep them in the vessel while heating. When all are completely fused, they must be well stirred, and run into bars. Solder No. 1 is for gold 16 carats and upwards; No. 2 is for that 14 carats fine; and No. 3 for lower qualities. If more zinc is added, it will fuse at a lower heat, but the colour is not so good. 150. MOCK GOLD Fuse together 16 parts of copper, 7 of platinum, and 1 of zinc. When steel is alloyed with 1/500 part of platinum, or with 1/500 part of silver, it is rendered much harder, more malleable, and better adapted for all kinds of cutting instruments. Note.--In making alloys, care must be taken to have the more infusible metals melted first, and afterwards add the others. 151. BRITANNIA METAL Take 4 parts of brass, and 4 parts of tin; when fused add 4 parts of metallic bismuth, and 4 parts of metallic antimony. This composition is added at discretion to metallic tin, according to the quality you wish to make. 152. BLANCHED COPPER Melt together 8 parts of copper and a half part of arsenic. 153. COMMON PEWTER Melt together 4 parts of tin and 1 part of lead. 154. BEST PEWTER Melt together 100 parts of tin and 17 of antimony. 155. A METAL THAT EXPANDS IN COOLING Melt together 9 parts of lead, 2 of antimony and one of bismuth. This metal is very useful in filling small defects in iron castings, &c. 156. QUEEN'S METAL Melt together 9 parts of tin, 1 of antimony, 1 of bismuth, and 1 of lead. 157. IMITATION PLATINUM This metal, or alloy, very closely resembles platinum. Melt together 8 parts of brass and 5 parts of zinc. 158. CHINESE WHITE COPPER Melt together 40.4 parts of copper, 31.6 parts of nickel, 25.4 of zinc, and 2.6 of iron. 159. MANHEIM GOLD Melt together 3 parts copper, 1 of zinc, and a little tin. 160. TOMBACK, OR RED BRASS Melt together 8 parts of copper, and 1 part of zinc. 161. IMITATION GOLD Take of platina 8 parts, of silver 4 parts, copper 12 parts, melt all together. 162. IMITATION SILVER Take of block tin 100 parts, metallic antimony 8 parts, bismuth 1 part, and 4 parts of copper; melt all together. 163. TRUE IMITATION OF GOLD Dr. Harmsteadt's imitation of gold, which is stated not only to resemble gold in colour, but also in specific gravity and ductility, consists of 16 parts of platinum, 7 parts of copper, and 1 of zinc, put in a crucible, covered with charcoal powder, and melted into a mass. 164. TRUE IMITATION OF SILVER