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116
THE
COMPLETE
PRACTICAL
DISTILLER.
of
distillation.
This
restriction
is
established
for
the
preparation
of
fecula,
because
it
does
not
require,
for
dis-
tillation,
the
same
care
and
management
as
when made
for
domestic
purposes.
This
preparation
is
composed
of
two
operations
:
first,
the
rasping
of
potatoes;
second,
the
separation
of
their
fecula.
Even
sometimes,
when
the
distiller
does
not
choose
to
make
his
own
fecula,
he
buys
it
from
the
fecu-
list,
who
submits
it
to
a
third
operation
—
that
of
draining.
Thfese
various
operations
will
now
be
spoken
of.
RASPING.
As
a
matter
of
course,
the
object
of
this
operation
is
to
tear
the
tissue
of
the
vegetable,
the
cells
of
which
con-
tain
the
fecula
which
it
produces,
so
that
the
better
the
vegetable
is
divided,
the
better
the
rasping
will
have been
executed,
and
by
these
means
a
greater
quantity
of
fecula
will
be
obtained.
To
this
effect,
the
potatoes
are
submit-
ted
to
the
action
of a
rasp,
already
described,
and
which,
though
it
has
not
been
brought
to
perfection,
appears
to
be
the
best
made
use
of.
Immediately
after
this
operation,
the
following
com-
mences.
SEPARATION
OF
THE
FECULA.*
For
this
purpose,
a
large
sieve
of
horse-hair,
2
feet
in
diameter
and
1
foot
in
depth,
is
made
use
of.
It
is
placed
above
a
tub
on
two
cross-pieces,
and
then
filled
with
a
quantity
of pulp,
equal
to
about
two-thirds
of
its
contents.
This
pulp
is
strongly
rubbed
between
the
hands,
while
a