The Tiffin tribune. (Tiffin, Ohio) 1868-1887, 1873-02-13

fire, placing the crucible in the fur
mace at the lighting the fire, so that it
heats up gradually with its surroun9-
ings. After the first time even this
precaGtjOn is unnecessary.
STOVE POLISH.
PlumbagO of the best quality is the
only suitable material for stove pol
ish, but lower grades will produce 8
fair polish for trade; and if the man
ufacturer is sufficiently experert in
the examination, he may Use the best
grade of CeylOn 'dust," but much of
that which comes to market is too
poor. For stove polish, the plumbagO
should be pulverized till the particles
are too small to glisten, and what
would otherwise be q shining mass
becomes s dead black flour, and this
appearance is so near that of the
German black lead that the difference
can Only-be discovered by handling.
PlUmbagO cannot he pulveriZed fine
enough in stone mills without run
ninG il over so many times that the
cost is too great, and hence so much
poor stove polish is found in market,
offered by respectable manufacturers.
The black lead, even when pdlverizsd
equally fine, mas q harsh feeling be-
tween the thumb aid finger, POlishes
but little and with considerable rub
bing, leaving a dark poor polish
while the plumbagO, if good, feels
smooth, almost oily, and p"lishes
with very little rubbing, leaving q
bright, silvery polish. The finer the
pIumbagO Is pulveTiZed, the better it
Is for stove polish, as each particle
should be so small that it flattens out
at once on the iron, adheres to ii, and
polishes quickly while larger parti-
cles will ny off and be wasted, as well
as creating a dust, and requiring more
labor to produce a fine polish. The
polish from pure CeylOn plumbagO
will last on the iron fOI a long time,
while the polish from the German
black lead will burn a reddish brown
when the stove is raised to 3 red heat.
But as the German is less than half
the price of the CeylOn, it is used with
it as an adulteratiOn, and for the
cheaper kinds the German is used
alone.
LIQUID STOVE POLISH.
Liquid stove polish, called by
quacks in trade "inventiOns" and ad-
vertisc1 as such, are mixtures in
which .here is no value except the lit
tie plumbagO they contain, and the
liquid is generally water, with a little
soluble blue for n "blind." But re-
Gently there have appeared "iuven-
tiOns' Of this sort which are made
with various volatile fluids, the oh
ject being to apply something thai
will evapOrate quickly These Hp'i
are of no value m ti., my =. f'f'im
hagO being used la tbs M NlL. = al a.,
polish the article would be better II
made OF only plum bagO and water.
But some of the mixtures are danger
ous to have about 4 stove from the eX-
plOsive fluid used. a patent article
1 have seen is dangerous in any kitc!i-
en-, and no insurance company wnu d
write a policy on any building wlIeit
it is used, il the ingredients were
known. Liquid stove polish Is the
dearest form in which it is put up, be-
cause, in order 10 make the mixture
cheap, very little plumbagO is used.
FACINGs FOR lIOULDs, OR FSUNDERY
FACINGS.
For this purpose plumbago is but lit
tie understood, although it is used to
a limited extent. That it Is valuable
most skillfuI mOlders are aware, con-
sequently much of the trash that is
sold for "facings" is called plumbagO,
to make 1t sell, without containing a
particle OF anything even resembling
the real mineral. Most Of that which
is sold to the stove plate and other
smooth casting fOunderies for 'black
lead, ;" is innocent ground slate, but
some of it is a mixture Ot ground coal
and German black lead, while char
coal would be better than either If
ground fine enough. CeylOn plum
bago combines the two qualities of a
substance almost as refractory as
asbestos, and the most perfect con-
duetor of heat. These are the essen
tials of Il perfect "facing." 1t cannot
be pretended that any ether substInce
will answer as well, unless it will
combine and form fiuX upon the sur
face of the metal. AS for the mechan-
ical operation Of filling up the pores,
or smoothing the mold, plumbagO has
no equal. For iron castings it need
not be a perfectly pure article, but that
necessary @ lHIye 6r gSrg & wSqk sh
the best results.
For pianos, plumbag0 is employed
to coat the bridge over which the
wires are drawn, because of its perfect
lubrication it prevents the wire fro N
adhering to the wood, and should be
as free from impurity as that used by
. -. .V-.A--E-,,- h.rk v,na1 Npf ha !
veriZed as finely.
For organs, it is used To lubricate
the slides, and should be the same as
that used by piano makers.
The German black lead impaTts
peculiar tone to the colOrs and soft
ness and smOOthness to the touch Of
felt hats. The very best lump only
should be accepted. As 1t has once
been washed ard dried ia Jumps, they
will readily separate again In water,
and no pulyerizing is needed.
For cOlOring dark glass for c4rbOys,
bottles, ETC., the best German black
lead is used in Jumps, but no inferior
grade will answer.
For paint, plumbagO has long been
known rs possessing great value. The
elements do not exhaust it, water
sheds from it as from oil itself, and
fire does not affect it. The grade need
not be the highest.
For the bottoms of boats AMI yachts
it has long been used, especially for
racing boats but only the best Cey-
lon plumbagO, very finely pulverizad,
is valuable.
REFRACTORY MIXTURES.
For tweers, pointing up fIrnaces S,
etc, take "prime lump" CeylOn plum ?
bago, pulverized to scales rs directed
for crucib.es. Thea mix equa! parts
Of Dutch pipe clay, fire clay, half the
quantity by the measure, not weight
Of charcoal, and the same half guam
OF SILICA (pure quartz sand, ground fine,
being the bestt; to this mixture add
as much Of the plumbagO as possible,
and Leave the mass thin enough to
work. 1t should be made just thin
enough with water, so that it will run
rather sluggishly.
! PlumbagO for polishing should be Of
the very best quality, finely pulver-
/ lied. The German black lead is some
times used. Lu5 Is not ecOnO nical
/ for the powder maker, and for high
i priced powder il useless.
Shot is polished with plumblgo,
and it should be absolutely pure, pull
verized 70 the finest grade from Cey-
lon prime lump"
Left to Freeze TO Death.
The Pekin IN Register, Of last
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