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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
599
The
trap
for
this
purpose
is
a
somewhat
complicated
arrangement,
of
the
appearance
shown
in
Figs.
270
and
271.
The
surface-plate,
a
a
a
a,
is
oblong,
measuring
about
twelve
inches
by
six,
with
a
circular
opening
b
b
in
the
centre.
Below
it
are
fixed
vertically
two
brass
cylinders
c
and
d,
which
are
so
arranged
as
to
work
backwards
and
forwards
on
a
kind
of
railway
e
f
e
f,
in
the
direction
of
the
length
of
the
surface-plate,
just
so
far
in
either
direction
as
to
bring
c
or
d
in
turn
immediately
under
b.
The
two
cylinders
are
soldered
together,
so
that
the
one
cannot
move
without
the
other.
If,
therefore,
the
cylinders
are
drawn
back
to
the
utmost
by
means
of
one
of
the
bent
iron
rods
or
handles
g
h,
the
cylinder
c
will
be
below
the
opening
b,
as
in
Fig.
272.
If,
on
the
contrary,
they
be
pushed
forward,
d
will
in
turn
be
below
the
opening,
as
in
Fig.
273.
Each
cylinder
contains
a
brass
piston,
faced
with
zinc
on
its
upper
surface,
and
moved
up
and
down
by
a
lever
attached
at
right
angles
to
one
or
other
of
the
iron
handles
g
h
already
mentioned,
and
working
through
a
vertical
slot
in
the
side
of
the
cylinder.
A
piece
of
clock-spring,
attached
to
the
iron
handle
at
the
point
of
junction,
gives
the
piston
a
gentle
upward
tendency,
which
is
so
regulated,
that
if
either
of
the
cylinders
be
brought
under
the
opening
b,
the
piston
belonging
to
that
cylinder
is
made
to
rise
into
the
opening,
its
upper
surface
resting
just
flush
with
that
of
a
a
a
a.
The
piston
of
the
forward
cylinder
c
is
made
to
work
very
easily
within
it,
so
as
to
rise
spontaneously
by
the
action
of
the
spring;
but
that
of
the
hinder
cylinder,
d,
for
a
reason
which
will
presently
appear,
works
a
little
more
stiffly,
so
as
to
require
a
little
assistance
from
the
lever
to
make
it
rise
into
its
proper
position.
The
action
of
the
handles
g
h
is
outwards,
in
the
direction
of
the
arrows
in
Fig.
274,
the
movement
of
either
handle
in
the
direction
so
indicated
drawing
down
the
piston
to
which
it
belongs.
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