Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
1036
Enquire within upon everything
·
Robert Kemp Philp
733
2150.
Orange-Water
Ice.
Orange-Water
Ice
is
made
in
the
same
way
as
Lemon-water
ice.
2151.
Nitrate
of
Ammonium
as
a
Freezing
Mixture.
Another
substance,
which
is
free
from
any
corrosive
action
or
unpleasant
odour,
is
nitrate
of
ammonium,
which,
if
simply
dissolved
in
rather
less
than
its
own
weight
of
water,
reduces
the
temperature
about
twenty-five
degrees
below
freezing.
The
objections
to
its
use
are
that
its
frigorific
power
is
not
sufficiently
great
to
freeze
readily;
and
if
it
be
required
to
form
dessert
ices,
it
is
requisite
to
renew
the
process,
at
the
expiration
of
a
quarter
of
an
hour,
a
second
time,
and,
if
the
weather
is
very
hot,
and
the
water
used
is
rather
warm,
even
a
third
or
fourth
time.
Again,
nitrate
of
ammonium
is
a
very
expensive
salt;
even
in
France,
where
it
is
manufactured
expressly
for
this
purpose,
it
is
sold
at
the
rate
of
three
francs
a
pound;
and
in
England
it
cannot
be
obtained
under
a
much
higher
price.
One
great
recommendation,
however,
attends
its
use,
namely,
that
it
may
be
recovered
again,
and
used
any
number
of
times,
by
simply
boiling
away
the
water
in
which
it
is
dissolved,
by
a
gentle
fire,
until
a
small
portion,
on
being
removed,
crystallizes
on
cooling.
2152.
Washing
Soda
as
a
Freezing
Mixture.
If,
however,
nitrate
of
ammonium
in
coarse
powder
is
put
into
the
cooler,
and
there
is
then
added
twice
its
weight
of
freshly
crushed
washing
soda,
and
an
equal
quantity
of
the
coldest
water
that
can
be
obtained,
an
intensely
powerful
frigorific
mixture
is
the
result,
the
cold
often
falling
to
forty
degrees
below
freezing.
This
is
by
far
the
most
efficacious
freezing
mixture
that
can
be
made
without
the
use
of
ice
or
acids.
But,
unfortunately,
it
has
an
almost
insuperable
objection,
that
the
nitrate
of
ammonium
is
decomposed
by
the
soda,
and
cannot
be
recovered
by
evaporation;
this
raises
the
expense
to
so
great
a
height,
that
the
plan
is
practically
useless.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
