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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
659
In
some
boxes
the
double
flap
is
omitted,
the
front
being
single,
but
moveable,
and
working
as
already
explained.
In
this
case
the
box,
when
first
brought
forward,
has
the
glass
of
the
side
towards
the
audience
missing,
but
at
a
little
distance
its
absence
cannot
be
detected.
THE
MAGIC
DRUM.--This
is
in
appearance
an
ordinary
side-drum,
but
being
hung
up
by
cords
from
the
ceiling,
it
will
forthwith,
without
any
visible
drumsticks,
give
either
a
single
rap
or
a
roll,
or
keep
time
to
any
piece
of
music.
It
will
further
answer
questions
and
tell
fortunes,
indicate
chosen
cards,
etc.,
after
the
manner
of
the
magic
bell.
These
mysterious
effects
are
produced
by
two
hammers
or
drumsticks,
fixed
against
one
end
of
the
drum
on
the
inside.
Each
of
these
is
attached
to
the
keeper
of
an
electro-magnet,
but
there
is
a
difference
in
the
mode
of
their
working.
One
works
after
the
manner
of
the
bell,
giving
a
single
tap
whenever
contact
is
made,
but
thenceforward
remaining
silent
until
the
circuit
is
again
broken
and
again
completed.
In
other
words,
each
pressure
of
the
connecting
stud
produces
one
rap,
and
no
more.
The
second
hammer
is
differently
arranged.
By
means
of
what
is
called
a
“contact-breaker,”
the
movement
of
the
keeper,
when
attracted
by
the
magnet,
of
itself
breaks
the
circuit.
The
circuit
being
broken,
the
iron
is
no
longer
magnetic,
and
the
keeper
flies
back
to
its
old
position,
thereby
once
more
completing
the
circuit.
As
long
as
the
pressure
on
the
stud
continues,
therefore,
the
circuit
is
alternately
made
and
broken
in
rapid
succession,
involving
a
corresponding
movement
of
the
keeper
and
hammer,
and
producing
a
“roll”
of
the
drum.
The
use
of
the
two
hammers
involves
the
necessity
of
two
electrical
circuits
and
two
connecting
studs,
and
of
three
cords
to
suspend
the
drum
(one
being
common
to
both
circuits).
With
a
little
practice
in
the
management
of
the
two
studs,
the
single
rapper
may
be
made
to
beat
time
to
a
tune,
while
the
other
stud
brings
in
the
roll
at
appropriate
intervals.
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