Aluminum Silver

The following alloy is distinguished by its beautiful color, and takes a high polish: Copper 70, nickel 23, aluminum 7, total 100.

Babbitt Metal

There are a large number of recipes for this alloy, but the following gives an excellent composition for general use: Tin 50 parts, antimony 5 parts, copper 1 part.

How To Repair Cracked Bell

A cracked bell which gives a jarring sound may be improved by sawing or filing the ruptured edges so that they are not brought together by the vibration of the blow.

How To Preserve Iron Boiler-Tubes

A coating of red-lead and boiled linseed-oil, applied to iron boiler-tubes, acts as a great preservative.

Black Stain For Brass

Arsenious acid 2 parts, hydrochloric acid 4, sulphuric acid 1, water 80.

How To Utilize Brass Scrap

The best way is to melt it in with new brass, putting it in with the zinc after the copper is melted.

How To Blacken Brass

Mix 4 parts hydrochloric acid and 1 part arsenic (by weight); put on bright, dry, and lacquer.

How To Clean Brass

Rub bichromate of potash fine, pour over it about twice the bulk of sulphuric acid, and mix this with an equal quantity of water. The dirtiest brass is cleaned by this in a trice. Wash the metal immediately after in plenty water; wipe, rub dry, and polish with powdered rottenstone.

How To Produce Vert De Bronze On Brass

Dissolve 2 ozs. nitrate of iron and 2 ozs. hyposulphite of soda in 1 pint water. Immerse the articles till they are of the required tint, as almost any shade from brown to red can be obtained; then wash well with water, dry, and brush. One part perchloride of iron and 2 parts water mixed together, and the brass immersed in the liquid, gives a pale or deep olive-green, according to the time of immersion. If nitric acid is saturated with copper, and the brass dipped in the liquid and then heated, the article assumes a dark-green color.

Bronze For Gongs And Cymbals

This is made with 20 per cent of tin, and is hammered into shape while at a red heat; it is then tough and malleable, but is very brittle when cold.

Bronze For Small Castings

Fuse together 95 part of copper and 36 parts of tin.

Green Bronze

The bluish-green bronze used for ornamental articles is made of any metal, first covered with a varnish made of ground tin or bronze powder rubbed up with honey in gum-water. Then wash with a mixture composed of sal-ammoniac 1/2 oz., common salt 1/2 oz., and 1 oz. spirit of hartshorn in 1 pint vinegar. After applying the mixture, leave for a day or two in the sun, and then, if necessary, add a second coat. This is a good way to renovate old gas-fixtures.

Japanese Bronze

A curious bronze is produced in Japan, which, when made in thin plates, resembles slate, and is covered with designs in silver. It contains, in addition to copper, from 4 to 5 per cent of tin, and on an average 10 per cent of lead. The combination is easily moulded into thin plates. These are varnished, and through the covering the designs are scratched with a burin. The plate is then plunged in a silver-bath, when the silver is deposited on the unprotected portions. Lastly, it is placed in a muffle-furnace, when the copper blackens and the silver remains bright.