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1
1036
Enquire within upon everything
·
Robert Kemp Philp
859
2490.
Permanent
Paste.
Permanent
Paste,
made
by
adding
to
each
half-pint
of
flour
paste
without
alum,
fifteen
grains
of
corrosive
sublimate,
previously
rubbed
to
powder
in
a
mortar,
the
whole
to
be
well
mixed;
this,
if
prevented
from
drying,
by
being
kept
in
a
covered
pot,
remains
good
any
length
of
time,
and
is
therefore
convenient;
but
unfortunately
it
is
extremely
poisonous,
though
its
excessively
nauseous
taste
would
prevent
its
being
swallowed
accidentally.
It
possesses
the
great
advantage
of
not
being
liable
to
the
attacks
of
insects.
2491.
Liquid
Glue.
The
liquid
glue
of
the
shops
is
made
by
dissolving
shelac
in
water,
by
boiling
it
along
with
borax,
which
posesses
the
peculiar
property
of
causing
the
solution
of
the
resinous
lac.
This
preparation
is
convenient
from
its
cheapness
and
freedom
from
smell;
but
it
gives
way
if
exposed
to
long-continued
damp,
which
that
made
with
naphtha
resists.
2492.
Common
Glue.
Of
the
use
of
common
glue
very
little
need
be
said;
it
should
always
be
prepared
in
a
gluepot
or
double
vessel,
to
prevent
its
being
burned,
which
injures
it
very
materially.
The
chief
objection
to
the
use
of
this
contrivance
is,
that
it
renders
it
impossible
to
heat
the
glue
in
the
inner
vessel
to
the
boiling
point;
this,
however,
can
be
obviated
by
employing
in
the
outer
vessel
some
liquid
which
boils
at
a
higher
temperature
than
pure
water,
such
as
a
saturated
solution
of
salt
(made
by
adding
one-third
as
much
salt
as
water).
This
boils
at
224°
Fahr.,
12°
above
the
heat
of
boiling
water,
and
enables
the
glue
in
the
inner
vessel
to
be
heated
to
a
much
higher
temperature
than
when
pure
water
is
employed.
If
a
saturated
solution
of
nitre
is
used,
the
temperature
rises
still
higher.
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