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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
602
It
is
obvious
that
the
changing
trap
will
be
equally
available
to
produce
an
object
under
an
empty
cover.
The
object
to
be
produced
will
be
placed
in
c
as
above,
the
piston
in
d
going
down
empty,
and
that
in
c
rising
with
the
object
upon
it.
The
above
are
the
traps
in
most
frequent
use,
but
there
are
others
designed
for
special
purposes.
Thus
there
is
a
trap
for
causing
the
disappearance
of
six
or
eight
half-crowns
(as,
for
instance,
in
the
well-known
trick
of
the
“crystal
cash-box,”
which
will
be
described
in
the
course
of
the
present
chapter).
Of
course
the
coins
could
be
made
to
disappear
through
an
ordinary
trap,
but
they
would
cause
a
suggestive
“chink”
in
their
fall.
The
trap
to
which
we
are
now
referring
(see
Figs.
275
and
276)
is
designed
to
prevent
this
tell-tale
sound,
and
to
cause
the
half-crowns
to
disappear
in
perfect
silence.
The
opening
in
the
surface
plate
is
an
inch
and
three-quarters
in
diameter,
and
is
closed
by
a
circular
piston
of
brass
or
zinc,
a,
working
up
and
down
in
a
small
brass
cylinder
b,
and
so
arranged
as
to
drop
by
its
own
weight
to
the
bottom
of
the
cylinder,
save
when
kept
up
by
a
little
lever
catch
at
the
side
of
the
cylinder.
A
short
pin
d
attached
to
this
catch
projects
upwards
through
a
slot
in
the
surface
plate,
and
stands
up
very
slightly
above
the
cloth
of
the
table.
The
disc
a
being
raised
level
with
the
surface
plate,
and
secured
by
means
of
the
catch,
six
or
eight
half-crowns
or
florins
are
placed
on
a.
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