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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
201
There
is
a
further
appliance
in
connection
with
the
box
in
question,
which,
however,
may
be
used
with
or
without
it,
as
may
best
suit
the
trick
in
hand.
This
is
a
loose
slab,
a,
of
the
same
wood
of
which
the
interior
of
the
box
is
made,
of
the
thickness
of
cardboard,
and
of
such
a
size
as
to
fit
closely,
though
not
tightly,
in
either
half
of
the
box.
When
so
placed,
it
has
the
appearance
of
the
inside
top
or
bottom
of
the
box.
When
the
box
is
closed
in
such
manner
that
the
part
in
which
this
slab
is
placed
is
uppermost,
the
slab
falls
into
the
lower
portion,
thus
forming
a
false
bottom
on
whichever
side
happens
to
be
undermost.
If
a
card
(say
the
ace
of
hearts)
be
secretly
placed
in
either
side
of
the
box,
and
this
slab
placed
on
it,
the
box
will
appear
empty.
If
now
another
card
(say
the
knave
of
spades)
be
openly
placed
in
either
side,
and
the
box
closed
in
such
manner
that
the
portion
containing
the
false
bottom
is
undermost,
no
change
will
take
place;
but
if,
either
in
closing
the
box
or
subsequently,
it
is
so
placed
that
the
side
containing
the
false
bottom
becomes
uppermost,
the
false
bottom
will
at
once
drop
into
the
opposite
division,
and
on
re-opening
the
box
the
ace
of
hearts
will
be
revealed,
and
the
knave
of
spades
will
in
its
turn
be
concealed.
The
effect
to
the
spectators
is
as
if
the
knave
of
spades
had
changed
into
the
ace
of
hearts.
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