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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
533
The
construction
of
the
other
two
vases
will
be
quickly
understood
upon
an
inspection
of
Figs.
222,
223.
a
is
the
vase,
and
c
the
cover
fitting
loosely
over
it,
but
between
these
two
is
a
well,
b,
made
double,
so
as
to
fit
at
once
into
and
outside
of
a,
after
a
mode
of
construction
which
we
have
more
than
once
had
occasion
to
notice.
There
is
a
bayonet-catch
at
the
lower
edge
of
c,
corresponding
with
a
pin
or
stud
at
the
lower
edge
of
b,
so
that
c
may
be
lifted
off
either
with
or
without
b.
There
is
a
similar
catch
at
the
lower
edge
of
b,
corresponding
with
a
stud
at
the
bottom
of
a,
but
cut
in
the
opposite
direction
to
the
other
catch,
so
that
the
action
of
unlocking
a
from
b
locks
b
to
c,
and
vice
versâ.
The
vase
a
requires
a
special
description.
A
shallow
saucer
of
tin,
d,
just
fits
the
interior
of
the
vase,
working
up
and
down
therein
piston-fashion,
but
prevented
from
coming
out
altogether
by
the
fact
that
the
upper
edge
of
a
is
slightly
turned
inwards
all
round.
Below
d
is
a
spiral
spring,
whose
action
tends
to
force
d
to
the
top
of
the
vase,
as
shown
in
Fig.
222.
From
the
centre
of
d,
however,
there
extends
downwards
through
the
spiral
spring
a
piece
of
stiff
wire
e,
with
a
crook,
f,
at
the
end.
The
foot
of
the
vase
is
hollow
throughout.
If
the
saucer
d
is
forced
down
by
pressure
from
within,
this
wire,
as
soon
as
it
reaches
the
position
shown
in
Fig.
223,
will
hook
itself
within
the
foot
of
the
vase,
and
so
keep
down
d,
until
the
crook
is
again
released,
when
the
whole
will
instantly
return
to
the
condition
shown
in
Fig.
222.
The
bottom
of
the
foot
is
open,
so
that
the
fingers
can
without
difficulty
find
and
release
the
crook
when
necessary.
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