Or-Molu

The or-molu of the brass founder, popularly known as an imitation of red gold, is extensively used by the French workmen in metals. It is generally found in combination with grate and stove work. It is composed of a greater portion of copper and less zinc than ordinary brass, is cleaned readily by means of acid, and is burnished with facility. To give this material the rich appearance, it is not unfrequently brightened up after "dipping" (that is cleaning in acid) by means of a scratch brush (a brush made of fine brass wire), the action of which helps to produce a very brilliant gold-like surface. It is protected from varnish by the application of lacker.

Blanched Copper

Fuse 8 ounces of copper and 1/2 ounce of neutral arsenical salt with a flux made of calcined borax, charcoal dust and powdered glass.

Browning Gun Barrels

The tincture of iodine diluted with one-half its bulk of water, is a superior liquid for browning gun barrels.

Silvering Powder For Coating Copper

Nitrate of silver 30 grains, common salt 30 grains, cream of tartar 3 1/2 drachms; mix, moisten with water, and apply.

Alloy For Journal Boxes

The best alloy for journal boxes is composed of copper, 24 lbs.; tin, 24 lbs.; and antimony, 8 lb. Melt the copper first, then add the tin, and lastly the antimony. It should be first run into ingots, then melted and cast in the form required for the boxes.

Alloy For Bells Of Clocks

The bells of the pendules, or ornamental clocks, made in Paris, are composed of copper 72.00, tin 26.56, iron 1.44, in 100 parts.

An Alloy For Tools

An alloy of 1000 parts of copper and 14 of tin is said to furnish tools, which hardened and sharpened in the manner of the ancients, afford an edge nearly equal to that of steel.

Alloy For Cymbals And Gongs

An alloy for cymbals and gongs is made of 100 parts of copper with about 25 of tin. To give this compound the sonorous property in the highest degree, the piece should be ignited after it is cast, and then plunged immediately into cold water

Solder For Steel Joints

Silver 19 pennyweights, copper 1 pennyweight, brass 2 pennyweights. Melt under a coat of charcoal dust.

Soft Gold Solder

Is composed of four parts gold, one of silver, and one of copper. It can be made softer by adding brass, but the solder becomes more liable to oxidize.

Files

Allow dull files to lay in diluted sulphuric acid until they are bit deep enough.

To Prevent Rusting

Boiled linseed oil will keep polished tools from rusting if it is allowed to dry on them. Common sperm oil will prevent them from rusting for a short period. A coat of copal varnish is frequently applied to polished tools exposed to the weather.

Fluid For Tinning Iron, Copper, Brass And Zinc

To 1 quart of muriatic acid add small pieces of zinc, until bubbles cease to rise; add 2 ounces ground sal ammoniac. for tin add 2 parts water.