Delaware gazette. [volume] (Delaware, Ohio) 1855-1886, 1869-12-24
mARVIN,s PATENT. ALUM AND
DRY PLASTER FIRE, BURG

We desire TO to call the att ention of
all those desiring a Fire and Burglar
proof security TO few facts regarding
Safes, which we think it important
every one should know.
By the great improvements which we
have lately made in Safes, We have en-
tirely changed the mode of manufac-
ture, and are thereby enabled to pro-
duce an article far superior to any
other.
In every Safe that is perfectly fire.
proof, the filling must be of such a na-
ture as to generate steam; for as long
as the contents of a Safe are surround
ed by wet mass, nothing can be in
iured by fire. This fact has long been
known and recognized by all Safe man
facturers.
The points requiredin The fre-proof
filling of Safe, may be enumerated as
follows:
F15i8t-It must be a slow conductor of
heat.
Second--It must contain large guam
ltity of water to vaporiZe when attacked
by fire.
Third-IE must be unehangeabIe un-
til more than ordinary degree of heat
is applied In this consists one of
the chief merits of using alum.
FIourth-It must lae o. such consisten-
| cy that 1t will neither escape through
small leaks, nor crack into fragments
when exposed to vl5lenG heat, or to
severe cOncussion inlfalling.
| FItth-It should net Oxidize or rust
| the iron frame, as oil wet mixtures,
such as plaster mixed with water, are
so we'll known to do.
SLCth-It should not communicate
dampness to the interior chamber. and
| thereby mold books, impair parchment
| and other yaluables.
SeUentI,--Its value in all the above
conditions should not be imp 4ired by
age and reasonable usage.
In Safe that is thoroughly 6re7proof
there must be something to generate
steam. The most fire-proof safes here
t0fore made were filed with plaster-of-
paris mixed with water, or concrete,
which is made Of water-lime orcement,
with water.
The objections to the use of water for
filling Safes are:
It renders the Safe very damp, inns
materially injuring, and often ruin
ing books and valuable papers.
It eorrodes the iron work of the Safe
and rusts the holes, through which the
filing oozes out. 1t destroys the locks
and corrodes the bolts often destroying
their use.
By the ordinary evaporation of the
water, (the Safe standing in heated
store or Office the fre-proof quality
is constantly deteriorating and by ex-
posure to freezing in a very cold at
mOsphere It's efficiency is destroyed.
By our patent we entirely obviate
ALL these objections, as we use PER
FECTLY DRY flling--composed of DRY
CALGINED PLASTER OF PARIS AND
ALUM.
We pack this mixture between the In
ner and outer cases, where it remains
unchanged any number of years, until
fire melts The alum (Which contains a
large quantity of water), and thus satu :
rates the plaster, and forms the steam,
which always preserves the contents
of the Safe. The plaster, by being
wet, sets firmly, and even if the alum
near the outside is entirely melted, it
forms cells, which retain the precise
shape of the Jumps of alum, and the
filling or plaster keeps the Safe as well
filed a ? before the fire.
TIE dvantage of using a dry filling
are very apparent, viz:
1t does not mould the contents Of the
Safe.
It neUer can rust the iron.
A'ld a0iU aLlDays remain perfectly fire
proof.
Please send for catalogue to.
MARVIN g. Co.,
105 Bank street, Cleveland, O.;
265 Broadway, New York;
72l Chestnut street, Philadelphia.
Oct. % At.