The Maryville times. (Maryville, Tenn.) 1884-1944, 1891-06-24
heated to nearly . white heat and then

smoothness. They are then picked in
a prepared bath Of muriatio acid, but
only remain there short time, when
they are taken out, washed thoroughly
by shaking in cradle and soaked for a
time in pure water in order to free them
from the acid. They are then again
cold rolled, annealed once more, as be-
fore described, and again piclxled in
what is called white bath; that is,
bath of very weak and diluted acid,
which thoroughly deoxydizes and clean
SEES the surface. After this second pick
ling they are again put to soak in pure
water where they remain for an indef-
mite time or until they are wanted for
the final processes of timing.
"This requires say three small iron
pots large enough to hold the plates
upright. The pots are placed adjoining
over small furnace, to heat the coat
ing metal which they contain. The
blank plates are now placed in one OF
the pots, immersed in the metal, which
is covered with fux Chloride OF zinc).
After soaking in this for short time
they are plunged in the next pot, con-
tanning palm oil, and out of that into
the third pot, immersed in the molten
tin, and, if to be full coated, withdrawn
with tongs so that all the metal they
will hold remains on them and is
chilled and set as soon as the air strikes
it. But if the plates are to be OF the
cheaper quality the metal is stripped
off by the plates passing out through
rollers placed just at the top of the mol
ten metal They now require only to
be rubbed through bran or shorts to re-
move any fux or grease that may ad-
here. and they are finished. Some OF
the makers of the cheapest plates only
pass them through one pot, while others
vary the process more or less in other
ways"
KINDS OF TIN DESCRIBED.
"What," the reporter asked, ''are
terne and roofing plates, and what does
the term 'full-coated' mean as applied
to them?"
''They are one and the same thing"
he replied. "Terne is French word
meaning dull not bright They only
differ from ordinary tin plate in that
they are coated with an alloy of tin and
lead, mostly lead. Full coated as APP
piled to terne or any other kind of tin
plate, means that the sheet of iron or
steel is allowed to absorb and hold all
the metal that will adhere to it. Most
plates of late years, especially the
cheaper kinds, either tin or terne, are
stripped by being passed through hot
rolls, so that the poorer qualities have
left on them only the merest glazing of
coating metal. You will also hear the
terms old style, old method ETC.,
used in this connection. They simply
mean that the plate is full coated and
has not been stripped"
"Are there now any works in this
country capable of making the steel
bars referred to-"
Eyes, plenty of them. Any Of the
large works that roll structural iron or
steel conld make them, and no doubt it
will soon become quite business, for
those who want to engage in making
tin plate need not have very extensive
plant if they begin with ready made
bars as is done in England, and larger
works would only mean more sets of
machinery"
What is the cost of plant to make
tin plates?"
"That would be impossible to say.
1t might vary from $500 to several mil
lions, according to what stage of the
process you made beginning. For
$500 man could set up small timing
machine, and, buying his blank plates,
tin them himself. He would really be
maker of tin plates, and expect that
this thing will be done by good many.
On the other hand should he decide to
make his plates from the ground up
that is from the ore, it would be almost
impossible to say what it would cost
him. A good sized blast furnace
costs about half million. Then
he would have to set up plant to
convert his iron into steel. Next he
would have to have large rolling mill
to roll his steel into bars, and after this
a smaller one to roll his bars into
plates, besides timing plant, furnaces
and much more, the cost of which would
be enormous Of course, this last plan,
is not usual, even if it exists at all, most
tin plate makers beginning either with
the ingot or the bar, but even then the
expense varies so with the size and ca
pacity of the plant that definite tgure'
can not be given. IN. Y. Press.
The Late Congressman Houck, Of Tennes