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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
204
THE
MECHANICAL
CARD-BOX.--This
also
is
a
piece
of
apparatus
for
changing
a
chosen
card
to
another.
It
is
somewhat
the
same
in
principle
as
the
card-boxes
last
described,
but
differs
from
them
a
good
deal
in
detail.
It
is
an
oblong
wooden
box,
in
external
measurement
about
four
and
a
half
inches
by
three
and
a
half,
and
four
inches
high.
Internally,
the
measurement
is
so
arranged
that,
putting
the
lid
out
of
the
question,
the
front
of
the
box
is
of
exactly
equal
area
with
the
bottom.
Against
this
front
(see
Fig.
51)
lies
a
slab
of
tin
or
zinc,
working
on
a
cloth
hinge
along
its
lower
edge,
thus
rendering
it
capable
of
either
lying
flat
on
the
bottom
of
the
box
(which
it
exactly
covers),
or
of
being
folded
up
against
the
front,
the
upper
edge
of
which
projects
slightly
inwards,
so
as
to
aid
in
concealing
it.
This
flap,
like
the
whole
inside
of
the
box,
is
painted
black.
On
one
point
of
its
upper
surface
is
a
little
stud,
which,
when
the
flap
is
raised,
fits
into
a
hole
prepared
for
it
in
the
lock,
across
which
passes
the
hinder
end
or
tail
of
the
bolt.
The
box
is
prepared
for
use
as
follows:--The
key
is
turned,
as
if
locking
the
box
(which,
however,
is
held
open),
thus
pushing
forward
the
bolt
of
the
lock,
and
the
flap
is
lifted
up
against
the
front,
the
stud
passing
into
the
little
hole
before-mentioned.
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