St. Paul daily globe. [volume] (Saint Paul, Minn.) 1884-1896, 1896-02-22

roll the larger ingots hot, /. e., at low
anneallng heat, though the metal is Oft
en- rolled cold into thin sheets from
1ngots Of an inch to an inch and a half
in thickness. Aluminium becomes hard,
and loses Its ductility under rolling
sooner than either steel, brass or cop
per, and therefore requires more fire.
quent annealing during the process.
Aluminium can be rolled so as to be
quite stiff. The hardest rolled, pure
aluminium is about the temper Of hard
ofass. 1t Will take a very high polish,
about equal to that of silver
aluminium unites readily with all
metals except lead antimony and mer-
curry, and many useful alloys have been
discovered in the last few years. The
useful alloys SO far have been prin-
clpally in two groups, the one of alumni
mum with not more than Is per cent of
other metals, and the other metals con-
tanning not over ID per cent of alumni
num- In one, case the metals impart
hardness and other useful qualities to
the aluminium. and in the other the
aluminium gives useful qualities to the
metals with which it is alleged. ALUMNI
mum and copper form two series Of val
liable alloys, aluminium bronze, con-
tanning from 2Ito II per cent of alumni
mum, and copper-hardened aluminium
conta1ng from % to 10 per cent of cop
per. The to- IL per cent aluminium
bronzes are among the densest, finest
grained and strongest alloys known
alloys having ductility along with ten
sile strength. The alloy of between 10
and IL per cent of aluminium with cop
per is the true aluminium bronze"
TOO DEAR FOR COMMON USE.
Until some radical change comes in
the manufacture of aluminium, the price
nf Il Il
1t Will be the main factor in all sorts of
metal work. And until some radical
change is made from the present meth
Oh or reducing aluminium, bauXite must
continue to be the chief ore from which
the metal is obtained. So far. the min
eral has been found in commercial
quantities in only two localities in the
United States. Discoveries that will
put down the price of aluminium are
looked for at any moment. DR.. C. w.
Hayes, OF the United States geological
survey, says that bauxite is principally
found in the southern portion of the
Appalachian valley and in Arkansas,
and that it is only in the southern por-
tons Of the Appalachians that the ore
bodies are developed to large scale.
Within the belt extending from Adairs-
Vile, Ca. southwark, distance of sixty
miles, to the vicinity Of Jacksonville,
Ala, the ore has been worked most eX-
tenslvely near Adairsville, and in the
Dyke district near Rock Run, Ala.
DR.. Hayes says that an interesting
question arises as to the supply of baux-
lite, and the possibility of it's being ex-
hausted in the near future. No esti-
mates have yet been made of the
amount Of ore in sight in this country,
and none can be made which will have
any claims to accuracy until at least
one of the representative ore bodies
shall have been thoroughly exploited
and their depth ascertained. The de-
velopment Of these deposits Is as yet in
Its infancy, and the opinion prevails
that they are inexhaustible; but this
same opinion existed a few years ago
concerning the linlonite deposits Of the
region referred to, and the limonite Is
now all gomez The favorable geologic
conditions are present in other portions
OF the Southern Appalachians, extend
Ing nearly to Central Alabama and
through Tennessee and Virginia
one OF the greatest difficulties, all in
Ventors are agreed, in thelu Of alum
mum more generally is the difficulty of
soldering it.. la fortune undoubtedly
awaits the man who shall invent a per-
feet aluminium solder. The aluminium
soldiers put upon the markets recently
are almost numberlessy and many of
them are nearithe0mark so far as tenn
pofary tests can establish, still there is
room for Improvement.