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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
594
1.
The
Plain
Trap.--This
consists
of
a
thin
plate
of
metal,
generally
zinc,
screwed
down
flush
with
the
top
of
the
table.
In
this,
which
we
will
call
the
surface
plate,
is
cut
a
hole,
generally
circular,
and
from
two
to
four
inches
in
diameter,
closed
by
a
flap
or
door,
which
by
the
action
of
a
spring
hinge
is
pressed
up
level
with
the
rest
of
the
trap,
though
it
instantly
yields
to
pressure
from
above,
again
rising
as
soon
as
such
pressure
is
removed.
Figs.
261
and
262
represent
the
trap
as
seen
detached
from
the
table,
Fig.
261
exhibiting
its
under
side.
a
is
the
circular
flap,
b
b
the
spring
hinge,
c
a
little
bolt
by
means
of
which
the
trap
may
be
fastened
at
pleasure,
and
which
is
worked
by
a
pin
projecting
upwards
through
a
slot
in
the
surface
plate,
and
through
the
cloth
which
covers
the
table;
d
is
a
small
flat
piece
of
metal,
screwed
to
the
under
side
of
the
flap
a,
and
acting
as
a
“stop”
to
prevent
the
flap
being
forced
by
the
action
of
the
spring
above
the
level
of
the
surface-plate.
The
“mountings”
of
the
trap
are
generally
brass,
and
attached
to
the
zinc
by
screws.
A
brass
eyelet,
e,
is
sometimes
soldered
to
the
centre
of
the
under
side
of
the
flap.
To
this
is
attached
a
cord,
which
may
hang
down
ready
to
the
performer’s
hand
at
the
back
of
the
table,
or
may
be
carried
down
a
groove
in
one
of
the
hinder
legs,
and
either
terminate
in
a
pedal
(to
be
pressed
by
the
foot
of
the
performer),
or
be
continued
behind
the
scenes
within
reach
of
the
hand
of
the
assistant.
The
mode
of
working
the
trap
is
as
follows:--Any
small
article,
being
placed
on
it,
is
covered
over
(either
with
an
ornamental
cover
or
with
a
simple
handkerchief).
The
cord
being
gently
pulled
by
either
of
the
means
above
mentioned,
the
trap
opens,
and
the
article
falls
into
the
body
of
the
table.
As
soon
as
the
pull
is
relaxed,
the
flap
again
rises
and
closes
the
opening.
Where
a
cord
is
not
used,
the
performer
gets
rid
of
the
article
by
direct
pressure
on
the
trap,
or
the
article
upon
it,
with
the
one
hand,
while
with
the
other
he
veils
the
opening
in
the
table.
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