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54
THE
COMPLETE
PRACTICAL
DISTILLER.
made
square,
may
be
divided
internally
into
several,
each
having
its
separate
head
and
condenser;
by
which
ar-
rangement
the
spirit
condensed
from
the
first
may
fall
into
the
second,
to
be
again
operated
upon,
and
so
on
to
a
third,
whereby
a
rectification
may
be
carried
on
to
any
degree
at
one
operation
and
by
one
fire.
In
the
still
shown
at
fig.
6
a
set
of
chains
are
seen
suspended
from
the
bar
e
e,
supported
by
a
central
shaft,
that
may
be
put
in
motion
by
a
toothed
wheel
and
pinion,
actuated
by
a
crank
or
winch.
These
chains
hang
in
loops,
and
fall
into
the
spaces
between
the
partitions, to
sweep
the
bottom
of
the
still
as
the
shaft
revolves
\
and
thus
they
prevent
the
material
acted
upon
from
burning,
when
of
a
thick,
glutinous
na-
ture,
as
turpentine,
syrups,
&c.
Ledges
may
be
placed
between
each
circle,
on
the
principle
more
particularly
explained
at
fig.
8,
which
is
square, oblong,
or
round,
its
bottom
intersected
with
portable
ledges,
fastened
at
the
ends
and
bottom,
if
square
or
oblong,
and
only
to
the
bottom,
if
round
;
except
that
under
each
alternate
ledge
a
space
is left,
of
any
width
required,
between
it
and
the
bottom,
so
that
the
liquid,
in
entering
at
the
end
or
cen-
tre,
passes
over
the
one
and
under
the
other
ledge,
until
it
arrives
at
the
point
of
discharge.
Thus
the
whole
mass,
whatever
depth
it
may
be
in
the
still,
is
submitted
to
the
full
efi'ect
of
the
fire
in
a
layer
of
the
thickness
of
the
space
between
the
ledge
and
the
bottom.
Fig.
9
difiers
essentially
from
all
the
others
in
this,
that
the
bottom
is
doubled
up
and
down
in
plaits,
and
repre-
sents
a
surface
commensurate
with
the
length,
depth,
and