Delaware gazette. [volume] (Delaware, Ohio) 1855-1886, 1869-12-17
MARVIN,s PATENT, ALUM AND
DRY PLASTER FIRE. BURG-


We desire to to call the attention Of
all those desiring a FiTe ana BHfgtar-
proof security to a few facts regarding
Safes, which we think it important
every one should know.
By the great improvements Whlch we
have lately made in Safes, We have en-
tirely changed the mode OF manuiac-
ture, and are thereby enabled 70 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 Safe are surround
ed by a wet mass, nothing can De IN
iured by fire. This fact has long been
known and recognized by all Sale man
The le points required in the fre-proof
filing of a Safe, may be enumerated as
follows:
heat
6econd-It must contain large guam
I tity of water to vaporize when attacked
by fire.
Ttird-It must be Interchangeable I'M
til more than OrdinsTy degree of heat
is applied In this consists one of
! the chief merits of using alum.
FoWTtb-It must be o! such consisten-
cy that it will neither escape through
| small leaks, nor crack into fragments
when exposed to violent heat, or to
severe cOncussion in falling.
1 Fiftb-It should not oXtd1Ze or rust
the iron frame, as al wet mixtures,
such as plaster mixed with water, are
| so we'll known to do.
iSicth-It should not communicate
dampness to the interior cha am Der, and
! thereby mold books, impair parchment
/ and other valuR bIes.
/ SeUenth-Its value in all the above
conditions should not be imp .ired by
| aOa and reasonable usage
In a Safe that is thoroughly fire-prOOf
there must be something to generate e
4 steam. The most fire-proof safes here
ttofore made were filled with pIaster-Of-
Eparis mixed with water, or concrete,
which is made Of wateF-lime orcement,
with water.
The objections tothe use of water. for
filling Safes are:
It renders the Safe very damp, thus
materially iniuring, and often ruin
ing books and valuable papers.
Il corrodes the iron work of the Safe
and rusts The holes, through which the
filling 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 fire. proof quality
is constantly deteriorating and by. ex-
posure to freezing in very cold at
mosphere its efficiency is destroyed.
By our patent we entirely ooviate
ALL these objections, as we use PER
FECTLY DRY filing composed of DRY
CALCINED PLASTER OF PARIS AMI
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 slea IN,
which always preserves the contents
of the Safe. The plaster, by being
wet, sets firmly. and even il the alum
near the outside is entirely melted, 1t
forms cells, which retain the pre- else
shape of the Jumps of alum, and the
filing or plaster keeps the Safe as welt
filed a . before the fire.
The dvantage of using dry hIHn-
are very apparent, viz.
It does not mould the contents Of The
SAFE.
II 1t qleUeT can T16St the iron.
Alad a0iU dtaCGys remain perfectly JTl'e-
PROOF.
Please send for catalogue to.
MARVIN s. Co,
Jos Bank street, Cleveland, o.;
265 Broadway, New York;
72I Chestnut street, Philadelphia.
Oct. q At.