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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
314
A
closer
inspection
of
the
target,
which
is
sometimes
of
wood,
but
more
often
of
tin,
japanned,
would
disclose
the
fact
that
the
bull’s-eye
is
moveable,
revolving
perpendicularly
on
its
own
axis.
It
is
coloured
alike
on
both
sides,
and
each
side
is
provided
with
such
a
hook
as
already
mentioned,
so
that
whichever
side
of
the
bull’s-eye
is
for
the
time
being
level
with
the
face
of
the
target,
no
difference
is
perceptible
to
the
spectator.
There
is
a
little
projecting
pin,
or
stop,
at
one
point
of
the
diameter
of
the
bull’s-eye,
which
prevents
its
making
more
than
a
half
revolution,
and
a
little
spiral
spring,
attached
to
one
of
the
two
pivots
on
which
it
moves,
compels
it
to
turn,
when
at
liberty,
always
in
one
particular
direction
until
stopped
by
the
pin,
so
that
its
normal
condition
is
to
have
one
particular
side,
which
we
will
call,
for
greater
clearness,
side
a,
always
turned
towards
the
face
of
the
target.
The
bull’s-eye
may,
however,
be
turned
round,
so
that
the
opposite
side,
b,
is
towards
the
face
of
the
target,
and
there
is
a
little
catch
which
retains
it
as
so
turned;
but
the
instant
the
catch
is
withdrawn,
the
action
of
the
spring
makes
it
fly
round
again
to
its
old
position.
The
catch
is
released
by
means
of
a
stiff
wire
passing
through
the
pillar
on
which
the
target
rests,
and
terminating
in
a
round
disc
of
metal
in
the
foot.
The
mode
of
connection
between
the
wire
and
the
catch
varies
according
to
the
fancy
of
the
maker;
but,
whatever
this
may
be,
the
catch
is
invariably
released
by
an
upward
pressure
of
the
disc
from
below.
If
the
target
is
held
in
the
hand
of
the
assistant,
this
is
effected
by
the
direct
pressure
of
the
fingers;
but
in
stage
performances,
where
the
target
is
placed
on
a
table,
this,
as
indeed
almost
every
other
mechanical
piece,
is
set
in
motion
by
the
upward
movement
of
a
wire
rod
(known
as
a
piston),
made,
by
the
pulling
of
a
string,
to
rise
through
the
upper
surface
of
the
table.
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