containing the fluoride," and may be used for a variety of manufacturing
and ornamental purposes.

The most important alloy of aluminum is composed of aluminum 10, copper
90. It possesses a pale gold color, a hardness surpassing that of
bronze, and is susceptible of taking a fine polish. This alloy has found
a ready market, and, if less costly, would replace red and yellow brass.
Its hardness and tenacity render it peculiarly adapted for journals and
bearings. Its tensile strength is 100,000 lb., and when drawn into wire,
128,000 lb., and its elasticity is one-half that of wrought iron.

General Morin believes this alloy to be a perfect chemical combination,
as it exhibits, unlike the gun metal, a most complete homogeneousness,
its preparation being also attended by a great development of heat, not
seen in the manufacture of most other alloys. The specific gravity of
this alloy is 7.7. It is malleable and ductile, may be forged cold as
well as hot, but is not susceptible of rolling; it may, however, be
drawn into tubes. It is extremely tough and fibrous.

Aluminum bronze, when exposed to the air, tarnishes less quickly than
either silver, brass, or common bronze, and less, of course, than iron
or steel. The contact of fatty matters or the juice of fruits does not
result in the production of any soluble metallic salt, an immunity which
highly recommends it for various articles for table use.

The uses to which aluminum bronze is applicable are various. Spoons,
forks, knives, candle-sticks, locks, knobs, door-handles, window
fastenings, harness trimmings, and pistols are made from it; also
objects of art, such as busts, statuettes, vases, and groups. In France,
aluminum bronze is used for the eagles or military standards, for armor,