Clearfield Republican. [volume] (Clearfield, Pa.) 1851-1937, 1873-03-26
Glue Making.

are put into an apparatus in the shape |
Of hollow globe, and made Of wrought
iron "copper" cannot bc used because
The gelatine has very powerful &C
tion upon it). The first process is 10
cleanse the bones by immersing them
in a pit or cistern Of water, where they
remain about twelve hours tho water
is then drawn off and fresh water ad-
ded 10 them; this operation Is some
times repeated TO remove any dirt,
&c. The water being withdrawn from
the bones, q solution Of lime in the
Of one bushel Of lime TO
500 gallons Of water, is to DO poured
into the cistern for the moro perfect
cleansing Of the bones and the rsmov-
al of any surerhuous matter. After
three or four days saturation the lime
solution should be drawn off and fresh
water added, to get rid Of the lime
Thus prepared, the bones are placed
in tho globular vessel called the ex-
tractor, which is filed with them, by
removing tho interior plate which
covers the manhole; this aperture is
Of an ellipstical form, and allows tho
plate to be clipped round and refixed
in its place by turning q nut which
draws It up tight against the interior
surface of the extractor, and the juno
tures are made air-tight by luting.-
The'extractor turns upon horizontal
cylindrical shaft one-half Of this shaft
is made hollow, or consists of q strong
tube, which tube also proceeds down.
ward toward the centre of the vessel
to conduct the steam beneath the
grating upon which the bones are laid.
The steam, of about l5lbs. pressure, is
admitted by tho cylindrical shaft, pro-
ceeds first to the bottom Of the ex-
tractor, closing II after the admission
of steam. While the steam is acting
upon the bones the extractor is oc-
casionally turned round by means Of
a hand-winch. When at rest, a guam
tity Of fluid gelatine is collected at
tho bottom of the extractor, from
whence it is discharged by means Of o
cock into tube beneath, after open
ing the air.cocK to allow it to run of.
This done, steam is again admitted
from the boiler into the extractor 10
act upon the bones for another hour,
when the second portion of condensed
liquor is drawn of. When the pro
ducts thus obtained have become cold,
the fat which has formed upon the
surface is to be carefully removed by
skimming, and the gelatinous portion
only Is to be returned into the extrac.
tor by means Of a funnel through the
cock on the top The steam is then
admitted to the extractor for another
hour, after which it is finally drawn
of into another vessel, to undergo q
simple evaporating process, until il
arrives al proper consistency to col
idify it. When cold this gelatinou.
mass is cut out into square cakes, and
dried as usual in the open air. Com
mon glue is often extracted from hoofs
horns, and cuttings Of the hides o.
various animals. For this process the
materials arc first stepped in water
for two or three days, then well wash
cd, and afterward boiled TO the con
sistency Of thick jelly, which is passed
while hot through osier baskets, tc
separate the grosser particles Of dirt
bones, &c from il, and allowed tc
stand some time to purify further
When the remaining impurities have
settled to the bottom, it is then melted
and boiled a second time. II Is mex
poured into fat frames or moulds
from which 1t is taken out pretty hare
and solid, and cut into square piecei
or cakes, and afterward dried in tht
wind in coarse kind of net"
Another writer says:-"Glue is pro
psred chiefly from the refuse Of tan
neries, parings Of hides and skins, ant
tho tendons and offsl Of slaughter
houses; animal skin in any form, un
combined with tannin, may be mad,
into glue. A good deal Of glue i
made In France from bones freed frou
their phosphate Of lime by means o
hydro-chloric acid, but it possesse,
little adhesive force. Substances in
tended for the glue maker are macer
ated with milk Of lime for fourteen
days, aud dried by exposure to tn,
air they can then be transported h
any distance without undergoing de
composition. The manufacturer gen
orally treats the material again will
dilute milk of lime. They are thcl
carefully washed and exposed to th
air for about twenty or thirty hours
They are then placed 10 copper boil
er which has n perforated false bottom
which supports the materials and pre-
vents their being burnt the boiler !
filed about two thirds full Of water
and is piled up with tho animal sub
stances until they are level with tn
brim; u gentle but steady boil shoul
bo maintained, and the subtance
should be stirred from time TO time
When tho liquor on cooling form
q firm gelatinous mass, the clea
portion is run off into another vessel
and a small quantity Of dissolved alur
is added. II 10 kept warm by mean
Of hot water, and oil allowed to re
main undisturbed for some hours
deposit its impurities; it is next ru
into the congealing boxes, and left !
cool. The next morning tho masse
are turned out upon boards wette
with water, cut into small cakes, an
these cakes are placed upon netting
to dry. Tho dry cakes are tho
dipped into hot water, and lightl
rubbed with brush TO give them
gloss, and lastly stove.dried for sale
| This furnishes the best and palest glue
After the first liquor is drawn fror
the copper, the remains left In the boi
or are treated with fresh water agai
and again, until no gelatinous matte
can be extracted. - Cabinet Maker.
uow ~ "a DoNv.-Tho man WL