Putty. Whiting and antimony sulphide, and soluble glass.
This can be polished finely after hardening.

Common Putty. Whiting and linseed oil mixed up to form a dough.

RUST PREVENTIVE.--For Machinery. Dissolve an ounce of camphor in one
pound of melted lard. Mix with this enough fine black lead to give it an
iron color. After it has been on for a day, rub off with a cloth.

For tools, yellow vaseline is the best substance.

For zinc, clean the plate by immersing in water that has a small amount
of sulphuric acid in it. Then wash clean and coat with asphalt varnish.

SOLDERS.--For aluminum. Use 5 parts of tin and 1 part of aluminum as the
alloy, and solder with the iron or a blow pipe.

Yellow hard solder. Brass, 3-1/2 parts; and zinc, 1 part.

For easily fusing, make an alloy of equal parts of brass and zinc.

For a white hard solder use brass, 12 parts; zinc, 1 part; and tin, 2
parts.

SOLDERING FLUXES.--For soft soldering, use a solution of chloride of
zinc and sal ammoniac. Powdered rosin is also used.

For hard soldering, borax is used most frequently.

A mixture of equal parts of cryolite and barium chloride is very good in
soldering bronze or aluminum alloys.

Other hard solders are alloyed as follows: brass, 4 parts; and zinc, 5
parts. Also brass, 7 parts; and zinc, 2 parts.

Steel Tempering-.-Heat the steel red hot and then plunge it into sealing
wax.

For tempering small steel springs, they may be plunged into a fish oil
which has a small amount of rosin and tallow.

VARNISHES.--Black Varnish. Shellac, 5 parts; borax, 2 parts; glycerine,
2 parts; aniline black, 6 parts; water, 45 parts. Dissolve the shellac
in hot water and add the other ingredients at a temperature of 200
degrees.

A good can varnish is made by dissolving 15 parts of shellac, and adding
thereto 2 parts of Venice turpentine, 8 parts of sandarac, and 75 parts
of spirits.

A varnish for tin and other small metal boxes is made of 75 parts
alcohol, which dissolves 15 parts of shellac, and 3 parts of turpentine.

SEALING WAX.--For modeling purposes. White wax, 20 parts; turpentine, 5
parts; sesame oil, 2 parts; vermilion, 2 parts.

Ordinary Sealing. 4 pounds of shellac, 1 pound Venice turpentine, add 3
pounds of vermilion. Unite by heat.

CHAPTER XVI

HANDY TABLES

TABLE OF WEIGHTS FOR ROUND AND SQUARE STEEL.

The Estimate is on the basis of Lineal Feet. 1 cu. ft. of Steel--490
lbs.

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