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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
318
The
secret
lies
in
the
use
of
an
ingenious
little
piece
of
apparatus,
which
is
placed
in
the
waistcoat
pocket
of
the
performer,
and
from
which
the
sound
proceeds.
This
apparatus,
which
is
represented
in
Fig.
105,
consists
of
a
short
brass
cylinder
(about
an
inch
and
a
quarter
in
depth,
and
two
inches
in
diameter),
containing
a
small
clock-bell,
with
the
necessary
striking
mechanism,
which
is
wound
up
beforehand
with
a
key,
after
the
manner
of
a
watch.
This
mechanism
is
set
in
motion
by
pressure
on
the
button
a,
the
hammer
continuing
to
strike
as
long
as
the
pressure
is
continued,
but
ceasing
as
soon
as
the
pressure
is
removed.
The
cylinder,
which
is
perforated
all
round,
in
order
to
give
free
passage
to
the
sound,
is
placed
upright
in
the
left
pocket
of
the
performer’s
waistcoat,
which
should
be
just
so
tight
around
the
ribs
that
the
mere
expansion
of
the
chest
shall
cause
the
necessary
pressure
against
the
button
a,
the
pressure
ceasing
when
the
chest
is
again
contracted.
(The
placing
of
a
playing-card
in
the
pocket
for
a
to
rest
against
will
be
found
to
facilitate
the
arrangement.)
This
is
the
whole
of
the
secret.
In
working
the
trick
the
performer
has
only
to
take
care
to
hold
the
watch
in
a
tolerably
straight
line
between
the
pocket
and
the
audience,
when,
the
line
in
which
the
sound
travels
being
the
same
as
if
it
actually
came
from
the
watch,
it
will
be
almost
impossible
to
detect
the
deception.
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