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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
490
THE
CHANGING
COVER.--This
cover
is
available
not
only,
as
in
the
last
case,
to
produce
or
vanish,
but
also
to
change
one
article
for
another.
It
is
somewhat
of
the
pattern
of
an
ordinary
round
dish
cover,
with
a
metal
knob
on
the
top.
(See
Fig.
190.)
It
is
divided
by
a
vertical
tin
partition
a
(see
Fig.
191),
into
two
equal
compartments,
b
and
c.
The
lower,
or
open
side
of
each
of
these
compartments
is
of
course
semicircular.
A
flat
tin
plate,
d,
also
semicircular,
works
on
an
upright
axis,
e,
passing
upwards
through
the
centre
of
the
cover,
and
terminating
in
the
knob
on
the
top.
By
turning,
therefore,
this
knob
halfway
round
to
the
right
or
left,
the
performer
is
enabled
to
close
whichever
of
the
compartments
happens
for
the
time
being
to
be
open,
at
the
same
time
opening
that
which
was
previously
shut.
There
is
a
little
point
or
stop
on
the
upper
side
of
the
semicircular
plate,
which
meeting
resistance
from
the
vertical
partition,
prevents
the
plate
making
more
than
the
necessary
half-turn
either
way.
The
apparatus
is
prepared
by
placing
the
article
representing
the
result
of
the
supposed
transformation
(say
an
apple)
in
either
compartment,
and
turning
the
knob
so
as
to
close
that
compartment,
and
open
the
other.
The
article
to
be
changed
(say
an
orange)
is
placed
upon
the
table,
and
the
performer
places
the
cover
upon
it,
taking
care
that
the
open
compartment
for
the
time
being
shall
come
fairly
over
it.
He
then
gives
a
half
turn
to
the
knob,
thereby
closing
the
compartment
which
has
hitherto
been
open,
and
securing
the
orange
within
it,
and
at
the
same
time
releasing
the
apple,
into
which,
on
the
cover
being
again
raised,
the
orange
appears
to
be
transformed.
In
this
case,
as
in
the
last,
it
is
well
to
have
a
plain
counterpart
cover
to
hand
round
for
inspection
if
necessary.
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