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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
622
The
picture-frame,
which
is
of
the
appearance
shown
in
Fig.
292,
and
stands
altogether
about
two
feet
high,
is
backed
by
a
sort
of
wooden
box,
an
inch
and
a
half
in
depth,
and
a
little
smaller
than
the
external
measurement
of
the
frame.
The
inside
of
this
box
is
covered
with
black
cloth,
and
in
fact
forms
the
true
back
of
the
frame;
and
it
is
upon
this
that
the
borrowed
objects
are
fastened
by
means
of
small
sharp
hooks,
the
back
opening
on
hinges
to
facilitate
the
doing
so.
An
ordinary
spring
roller-blind,
also
of
black
cloth,
works
up
and
down
just
behind
the
opening
of
the
frame.
We
have
said
an
ordinary
spring
blind,
but,
in
truth,
the
usual
check
at
the
side
is
wanting,
and
the
blind
therefore,
if
drawn
down,
instantly
flies
up
again,
unless
held
down
from
below.
The
blind
terminates
at
bottom
in
a
square
lath,
five-eighths
of
an
inch
in
length
by
three-eighths
in
thickness,
with
a
wire
pin,
half-an-inch
in
length,
projecting
at
right
angles
from
its
hinder
side.
The
ends
of
this
lath,
when
the
blind
is
drawn
down,
sink
into
two
upright
grooves,
one
at
each
side
of
the
frame,
thereby
keeping
the
latter
square,
and
the
pin
in
a
horizontal
position.
The
catch
a
(an
enlarged
view
of
which
is
shown
in
Figs.
293,
294)
is
now
hooked
over
the
pin,
as
in
Fig.
293,
thus
holding
the
blind
down.
A
wire
rod,
attached
to
this
catch,
passes
down
the
column
on
which
the
frame
stands,
and
terminates
in
the
usual
disc
or
pedal
at
bottom.
When
an
upward
pressure
is
applied
to
this,
the
catch
assumes
the
position
shown
in
Fig.
294,
thereby
releasing
the
pin,
and
allowing
the
blind
to
fly
up.
The
blind
is
represented
in
Fig.
292
in
the
act
of
flying
up,
but,
in
truth,
its
rise
is
so
rapid
as
to
be
practically
invisible.
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