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ALUMINUM. 231
be accomplished I)}' placinj^- tlic i)iece of plate in a furnace
muffle, an e\en heat being- maintained until the metal is
hot enough to char the end of a pine stick, which should
leave a black mark behind it as it is drawn over the plate.
The metal on being withdrawn should be allowed to cool
slowly.
Melting.—Aluminum should be melted in ordinary
plumbago crucibles. The metal does not absorb or unite
with carbon when heating in contact with it. No flux is
needed to cover the molten metal, as it is non-volatile at
any temperature that can be obtained with an ordinary
furnace.
Casting.—Aluminum is now being used to considerable
extent in castings of all descriptions where lightness, non-
corrodibility, and silvery color are desired. Either iron,
sand, or plaster and marble dust molds can be used, the
metal being poured as cold as possible.
Polishing.—The truly distinctive and beautiful color of
To
aluminum is best brought out in highly polished plate.
polish, use rouge or tripoli ; or " Almeta Polish," which
was introduced by the Pittsburgh Reduction Co., and has
earned a well-merited reputation as an aluminum polish.
Its formula is as follows :
Stearic Acid, one part,
Fuller's Earth, one part,
Rotten Stone, six parts.
The whole ground very fine and well mixed.
Soldering.—Several methods of soldering aluminum have
proven more or less successful for some purposes; none of
them, however, are suitable for attaching artificial teeth to
be worn in the mouth. The only way in which the metal
has been successfully employed as a dental base is with the
rubber attachment.
Alloys.;—Aluminum, like iron, does not unite with mer-
ALUMINUM. 231
be accomplished I)}' placinj^- tlic i)iece of plate in a furnace
muffle, an e\en heat being- maintained until the metal is
hot enough to char the end of a pine stick, which should
leave a black mark behind it as it is drawn over the plate.
The metal on being withdrawn should be allowed to cool
slowly.
Melting.—Aluminum should be melted in ordinary
plumbago crucibles. The metal does not absorb or unite
with carbon when heating in contact with it. No flux is
needed to cover the molten metal, as it is non-volatile at
any temperature that can be obtained with an ordinary
furnace.
Casting.—Aluminum is now being used to considerable
extent in castings of all descriptions where lightness, non-
corrodibility, and silvery color are desired. Either iron,
sand, or plaster and marble dust molds can be used, the
metal being poured as cold as possible.
Polishing.—The truly distinctive and beautiful color of
To
aluminum is best brought out in highly polished plate.
polish, use rouge or tripoli ; or " Almeta Polish," which
was introduced by the Pittsburgh Reduction Co., and has
earned a well-merited reputation as an aluminum polish.
Its formula is as follows :
Stearic Acid, one part,
Fuller's Earth, one part,
Rotten Stone, six parts.
The whole ground very fine and well mixed.
Soldering.—Several methods of soldering aluminum have
proven more or less successful for some purposes; none of
them, however, are suitable for attaching artificial teeth to
be worn in the mouth. The only way in which the metal
has been successfully employed as a dental base is with the
rubber attachment.
Alloys.;—Aluminum, like iron, does not unite with mer-
