Delaware gazette. [volume] (Delaware, Ohio) 1855-1886, 1869-10-29
MARvIN,s PATENT, ALUM AND
DRY PLASTER FIRE, BURG
LAR AND DAdP-PROOF SAFES.

We desire 10 to call The att ention o.
| all those d+siring a Fire and BltY0gGl'
proof security TO a few facIs reaaTd dins
Safes, which we think it important
every one should know.
BY the great improvements which we
have lntt-Iv made in Safes, we have en-
tirely changed the mode of mauui &C.
urp, and are the rrby enabled to pro-
duce an article lar superior to any
other.
In every Safe that is perfectly fire.
proOf, the filling must be of such a ma
ture a. to generate steam; for "a Ioug
as the cont, nts of a Safe are Surround
ed by wet mass, nothing can be in
iuTed by fire. THIS fact has long been
knOwn and recognized by all safe man.
facturers.
The points required in the fire-proof
filling of Safe, may be enumerated as
follows:
FTa,st-It must be a slow conductor of
hear.
Second-It must contain large guam
thy OF water TO vapOrize when attack ed
by fire.
til a more than ordinary degree Of heat
IS hppl ed. In bhis CONSISTS one OF
the cb ct merits of using alum.
F0urth-It must beo such consiste n =
CIV has it wi.l ne tber escape thrOu gh
small leaks, nor crack into fragments
Wn6n B& DuS' q 10 vi l6nb neat, OF TO
severe cOncuS~iOn IN falling.
FfftI-It -hou1d not oxruize or rust
the iron frame, as all Wst mixtures,
Such as plaster mixed with water, are
SO we'll knuWn TO do.
SirtH-It should not communicate
dampness to the interior chamber, and
thereby mold books, impair parchm ent
and other valnabies.
SeUentR-Its value in all the above
conditions should not be imp ired by
age and reasonable usage.
In Safe ,haI is Jh1rou hly fire-prOof
there must be- something t. generate
steam. Tne most fire-pronf .fes here
to;nre made were filled with pl l4ster-oi-
paris mixed with water, or cODcrsIe,
which is made OF water-llme orcemont,
with water.
The objections to The use of water for
filling Safes are:
Il renders tht. Safe very damp, thus
materially iniuring, and often ruin
ing books and valuable papers.
It cOrrOdes the iron work OF the Safe
and ruSIs The holes, thTouA b which the
filling oozes out. 1t destroy s the locks
and corrodes the bolts often destroying
their use.
By the ordinary evaporation of the
water, (the Safe standing in u heated
store or of1ice,) the fire-proof qua lily
is constantly deUerinrating and by ex-
pOsure 10 freezing in very cold at
mosphere its efici ncy is destroyed
BY our patent we entirely ohvIHte
ALL hese objections, as we use a PER
FECTLY DRY filing composed of DRY
CALCINED PLASTER OF PARIS AND
ALUM.
We pack this mixture bet ween 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 fol ms the 81 cam,
which always preserves the contents
of The SAFE. Tue plaster, by being
wet, sets firm Y, and even if the alum
near the 0ut side is entirely melted, it
forms cells, which retain the precise
shape of the Jumps of alum, aud the
filling or plaster keeps the Safe as we'll
filled a. before the fire.
The advantage Of using a dry filling
are very apparent, viz :
10 does not mould the contents Of the
Safe.
II 71eUel' can Tltst the iron.
and 10iU dt,cdys remain perfectly ire
proof.
Please send for catalogue to.
MARVINd & Co.,
los Bank street, Clevrl tnd, o.;
265 Broadway, New York
I'll Chestnut street, Philadelphia.
Oct. % At.