Amalgam Far Electrical Machines

1. Tin, 1 oz.; zinc, 1 oz.; mercury, 2 oz.

2. Baettgw's Amalgam. - Zinc, 2 oz.; mercury, 1 oz. At a certain temperature (easily found by experiment) it powders readily, and should be kept in a tightly corked bottle. Said to be very good.

Cock Metal

Copper, 10; lead, 4. Used for casting cocks.

Copper Amalgam

Dissolve 3 oz. sulphate of copper in water and add 1 oz. sulphuric acid. Hang clean iron scraps in the solution until the copper has fallen down in fine powder. Wash this powder, moisten it with a solution of protonitrate of mercury, and then to each ounce of the powder add 2 1/2 oz. mercury, and rub up in a mortar. "When thoroughly mixed, wash well with hot water. This amalgam is easily moulded, adheres readily to glass, porcelain and some metals, takes a fine polish, and in 10 to 12 hours it becomes so hard that it will scratch gold or tin. When heated it softens, and may be easily moulded. As it does not contract on cooling, it has been used by dentists for filling teeth, and it might be used to good advantage for inlaying lines in dark wood.

Protonitrate of mercury is easily made by dissolving mercury in nitric acid.

Babbitt's Anti-Attrition Metal For Lining Boxes

First melt four pounds of copper, and, when melted, add, by degrees, twelve pounds best quality Banca tin; then add eight pounds regulus of antimony, and then twelve pounds more of tin, while the composition is in a melted state. After the copper is melted and four or five pounds of tin have been added, the heat should be lowered to a dull red heat, in order to prevent oxidation; then add the remainder of the metal. In melting the composition it is better to keep a small quantity of powdered charcoal in the pot, on the surface of the metal.

The above composition is made in the first place, and is called hardening; for lining work take one pound of the hardening and melt with two pounds Banca tin, which produces the very best lining metal. So that the proportions for lining metal are four pounds copper, eight regulus of antimony and ninety-six pounds tin.

The object in first preparing the hardening is economy, for when the whole is melted together there is a great waste of metal, as the hardening is melted at a much less degree of boat than the copper and antimony separately.

Belgian Antifriction Metals

For work exposed to great heat: Copper, 17; zinc, 1; tin, 0.5; lead, 0.25.

For parts liable to much concussion: Copper, 20; zinc, 6; tin, 1.

For parts exposed to much friction: Copper, 20; tin, 4; antimony, 0.5; lead, 0.25.

Cheap Antifriction Metal

Equal parts of zinc and lead melted together, and well stirred at the time of pouring into the box or bearing.

Fusible Metals

These are chiefly used as a means of amusement, spoons formed of them melting readily in hot tea or coffee. They have also been used to make plugs for steam boilers, the intention being that they should melt and allow the steam to escape when the pressure became too great. No. 4 has been used for making casts of coins and medals, and the beautiful French cliche moulds were made of it.

1. Newton's fusible metal: Bismuth, 8; lead, 5; tin, 3. Melts with the heat of boiling water.

2. Onion's metal: Lead, 3; tin, 2; bismuth, 5. Melts at 197 degrees, Fahrenheit.

3. Wood's fusible metal: Bismuth, 15; lead, 8; tin, 4; cadmium, 3. Melts between 150 and 160 deg. Fahr.

4. Cliche metal: Bismuth, 8; tin, 4; lead, 5; antimony, 1. The metals should be repeatedly melted together and poured into drops or granulated, until they are well mixed.

Pewter

Tin, 4; lead 1. Old articles of pewter form therefore, a very fine metal for solder.

Queen's Metal

Tin, 100; antimony, 8; copper, 4; bismuth, 1. Resembles silver in appearance.

Speculum Metal

Copper, 32; tin, 15; arsenic, 2. First melt the copper, and then add the tin which should have been melted in a separate crucible. Mix thoroughly and add the arsenic.

Type Metal

Lead, 44; antimony 8; tin, 1.