Mineral Point tribune. (Mineral Point, Wis.) 1869-1938, 1875-01-07
Clue.

The impression prevails to great ex-
tent that light-colored CLUES are the
purest and best; this is mistake, as the
light color is often produced by the mix
ture OF eXtraneOus matters, such as very
fine Paris white and dry white lead. 1t
is claimed that the introduction of
small quantity of either of these articles
gives increased strength, but expert
ments have failed to discover any adj
vantage from such additions. Gelatin is
the foundation of glue, and the nearer
pure the greater its adhesive aqualities
In all merchantable glue there is more
or less OF other substances which, with
out lmparting any strength, serve to in
vlte putretaction and destroy the gelatin.
lncipient puJrefaction may occur in the
glue factory or in the workshop; when
in the former il is difiicalt to detect, eX-
cept by soaking until soft when it will
emit disagreeable odor; such glue is
unit for use in a carriage factory, and
should never be purchased, no matter
what the price. Manufacturers too often
make use of such glue for canvasing and
other rough purposes, to the detriment
of their work. 1t is fixed rule among
| those who aim to produce the most dura
Bile work that there is no use to which
poor glue can be Pat, with safety, in
| carriage factory. If putrefaction occurs
in the workshop it is either the result of
carelessncss on the part of the workman
in allowing it to soak too long before
| cooking, or from making larger quantity
than can be used up in single day A
series of experiments made by practical
men revealed the fact that glue deterio-
rates every time it is heated up after the
first cooking, and that in the fourth heat
ing it had lost 80 per cent. of its adj
hesve quality. The fact shows the nd
vantage to be gained from cooking no
more than is absolutely necessary for
single days use.
In selecting glue, choose that which
when held up to a strong light is of uni
form color and free from flecks and
streaks Of all kinds.
The preparation of glue in the work
| shop is by no means difficult matter,
but 1t needs care-tirst, to avoid soaking
too long; second, to cook in such a man.
| ner that it will not become overheated or
burned. In soaking allow it to remain
in the water until it is softened, but not
long enough to cause it to fall apart or to
begin to decay. In cooking the vessel
holding the glue should always be placed
into another holding water, the heat i'm
parted by boiling water being all that is
| requisite to dissolve the glue greater
heat will surely injure it, and, next to
| putrefaction, overheating or burning is
its worst enemy. The Old-fashioned
| double kettle has not been improved
| upon by any of the modern appliances,
except perhaps, where a large tank, pro-
vided with steam pipes, by which the
| water is heated, is substituted. In some
| factories the glue kettles are set into
| tank and heated by the direct applica-
ton of steam; this is but little better
than putting the glue on the top Of
| stove; it Goes not burn it, but heats it
many degrees above what is necessary,
and seriously intefferes with its adhesive
| qualities
| The condition of the glue at the time
of its application is equally as important
a consideration as the selection and prep
| aration, and, no matter how good or pure
| it may be- if it is not hot and sufficiently
thin-to penetrate the pores of the wood
| it is Of no real value. In gluing all but
! very small surfaces the wood should be
warmed and the glue be as hot as it is
! possible to make it in regular glue ket-
| tie; if this is dsne the result viii be sat
| isfactory in every instance .-Haraess and
| Carriage Journal.