Clarke courier. [volume] (Berryville, Va.) 1869-1997, 1906-12-26
THE MAKING OF GLUE
MATERIALS WHICH PRODUCE THIS
USEFUL SUBSTANCE.

Waste From Hides, Horns and Hoofs
OF Animals n. Used, but the sinews
OF Animals slaughtered For Food
Givr the best Resulss-
Few substances are more generally
useful than glue At one time OF an
other nearly every householder has 10
use II. yet few persons know anything
about the different kinds or which Is
best for the purpose In hand.
For ordinary repairs to articles OF
wood. especially II no severe strain Is
TO be placed upon the object the pre-
pared CLUES are convenient and ade-
Quate. They are therefore often chosen
In preference to the old fashioned sort
But for strength and durability no glue
which is applied cold can compare with
the kind that Is first melted in glue
pot and then applied hot. and Of this
kind there are many grades, which
vary greatly in quality.
The manufacture OF hard glue. as 10
is usually called-that Is. glue which Is
to be used hot-is TO large degree the
utilization OF waste products. The raw
materials are pieces and scraplngs from
]
ing factories, parings from hoofs and.
best of all. sinews from animals killed
for food In the great slaughter houses.
The first process is a soaking in lime
water made thick enough to be called
milk OF lime" In this bath the slnews
and other glue material remain for two
weeks or more. in order that all the
grease and blood may be eaten av sys
but Immediately on removal the aa-
terial is exposed 20 currents OF AR.
which allow any adhering lime TO alb
sorb carbonic acid. This checks the &C
ton Of the alkai on the animal matter
and makes IL possible to keep the ma
terial i'm the dry state for an indefinite
I period or until 1t is desired to use II.
Previous TO boiling, the scrap is again
immersed for twentyfour hours in a
bath of milk OF lime. 1t Is then
placed in caldron built on the plan
of the housewives familiar double boil
err. This Kind Of vessel Is necessary TO
prevent burning on" Water is add
ed, and the mass is gently boiled until
Il firm gelatinous liquid results from
! cooling.
The clear portion is now drawn of
| from the first caldron into a second
vessel and Is known as first run slnew
glue"-the best OF all. a small guam
! tity Of alum dissolved in water is add
/ ed for the purpose OF clarifying the
glue 10y causing it to precipitate its i'm
purltics.
In n second double boiler the liquid
remains several hours, till 1t is perfect
/ ~ clear. and Is then run Off into the
congealing boxes. over the bottoms OF
which II spreads out in thin sheets.
! The boxes are run into the cooling
rooms. where they remain until the
/ glue has hardened enough to be re-
moved in sheets. but not enough to be
brittle. In this state 1t is ready to be
cut
! The sheets are laid upon boards
\ which have previously been wet 10
prevent the glue from sticking. Here
the cutting is done with tightly stretch
ed brass wires, as n firkin of butter Is
cut by the country grocer.
After a further drying on revolving
MEETINGS the sheets are dipped in hot
water and rubbed with brush to give
them n polish. Tney then pass to the
kilns for the stove drying" This re-
moves all moisture and leaves what ap-
pears to be a sheet OF translucent yell
lowish brown bottle glass. Indeed, the
best snew glue seems on casual ex-
animation TO be nearly as hard as
I glass, and a quick. sharp blow will
produce a fracture that Is clean cut
and vitreous. The best of this glue is
light in color
The residuum left in the caldron
when the first run" OF glue was drawn
Off Is boiled and boiled again, so long
as any gelatinous matter can be ex-
tracted from IL. The product is glue
of inferior grades, OF course, but use
full as sizing and for other purposes In.
various arts and industries. Although
still classed as sinew glue. the later
runs have not the strength OF the
first run. They are darker and less
translucent.
Not many years ago nearly all the
best glue was sold In sheets Today
by far the greater part is ground at
the factories to the fineness OF ordI-
nary sawdust. Since In this form IL
dissolves more quickly. It Is so pre-
ferred by woodworking factories.
which use large quantities. but as the
chances of adulteration are greater
when the glue is ground the purchaser
who wishes TO be sure of strength and
durability will choose the sheets.-Ed-
ward Williston Frentz In Youths Com
panion.