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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
484
As
this
“bayonet-catch”
is
of
constant
use
in
magical
apparatus,
it
will
be
desirable
to
describe
it
somewhat
minutely.
A
rectangular
cut
or
slit
(see
the
enlarged
view
in
Fig.
184)
is
made
in
the
lower
edge
of
the
cover
b.
Its
perpendicular
arm
is
about
a
quarter
of
an
inch
in
length,
and
its
width
about
an
eighth
of
an
inch.
A
small
pin
or
stud,
about
an
eighth
of
an
inch
in
length,
projects
perpendicularly
from
the
lower
edge
of
c,
at
such
a
height
that
when
b
is
placed
over
c,
the
upper
or
horizontal
arm
of
the
slit
shall
be
just
level
with
it.
If
the
upright
arm
of
the
slit
be
brought
immediately
over
this
pin,
the
latter
will,
as
the
cover
sinks
down,
travel
upward
along
the
opening
as
far
as
the
junction
with
the
transverse
portion
of
the
slit.
If
the
cover
be
now
again
lifted,
the
pin
will,
of
course,
offer
no
obstruction
to
its
removal;
but
if
the
cover
be
first
slightly
turned
to
the
right,
the
pin
will
become
engaged
in
the
transverse
portion
of
the
slit,
and
upon
then
lifting
the
cover,
it
will
carry
with
it
the
pin,
and
all
connected
with
it.
When
it
is
desired
to
lift
off
the
cover
alone,
it
will
only
be
necessary
to
turn
the
cover
a
little
to
the
left,
thus
bringing
the
pin
again
over
the
upright
portion
of
the
slit.
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