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750
Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
595
2.
The
“Wrist”
or
“Pressure”
Trap.--With
this
form
of
trap
the
use
of
a
cord
is
unnecessary,
the
trap
being
worked
from
the
surface
of
the
table,
by
pressure
upon
a
particular
spot.
The
manner
of
its
construction
will
become
clear
upon
an
inspection
of
Figs.
263,
264.
Fig.
263
represents
the
under
side
of
the
trap;
a
is
the
flap,
working
upon
a
spring
hinge
b
b,
as
already
explained
in
the
case
of
the
plain
trap;
c
c
is
an
oblong
piece
of
metal,
cut
out
of
and
lying
flush
with
the
surface-plate,
and
working
upon
an
ordinary
hinge
at
d.
When
c
is
pressed
down,
the
crosspiece
e,
which
is
soldered
to
it,
presses
down
the
lever
f,
and
this
in
turn
acting
upon
the
shorter
lever
g,
which
is
fixed
at
right
angles
to
the
rod
upon
which
the
flap
a
is
hinged,
causes
the
latter
to
open.
The
mode
of
using
the
wrist
trap
is
as
follows:--The
performer
has
occasion,
we
will
suppose,
to
cause
the
disappearance
of
an
orange,
as
for
instance,
in
the
“Bran
and
Orange”
trick,
described
at
page
335.
Placing
the
orange
upon
the
flap
a,
he
places
both
hands
round
it
as
though
to
pick
it
up
between
them.
(See
Fig.
265.)
In
this
position
the
under
side
of
the
hand
furthest
from
the
audience
(see
Fig.
266,
showing
the
right
hand
removed),
is
just
over
c,
and
pressing
gently
upon
it,
causes
the
flap
to
open,
and
the
orange
to
fall
through;
the
position
of
the
hands
completely
veiling
the
operation.
The
operator
now
leaves
the
table,
still
holding
his
hands
as
though
having
the
orange
between
them,
and
after
a
due
interval,
brings
them
closer
and
closer
together,
at
last
showing
that
it
has
vanished.
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