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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
651
SPIRIT-RAPPING.--This
deception
is
frequently
performed
by
the
aid
of
electro-magnetism,
although
the
raps
may
be,
and
in
most
instances
are,
produced
by
much
simpler
methods.
We
will
suppose
that
a
table
is
to
be
the
instrument
of
the
raps.
The
top
being
removed,
a
hollow
is
made
in
the
“frame”
which
supports
it,
and
in
the
cavity
thus
made
is
fixed
an
electro-magnet,
of
the
fashion
shown
in
Figs.
304,
305.
Upon
one
side
of
the
horseshoe,
at
the
centre
of
the
curve,
is
screwed
a
brass
spring
a,
to
the
opposite
end
of
which
is
attached
the
keeper
b.
The
effect
of
the
spring
is
to
hold
the
keeper
about
a
quarter
of
an
inch
away
from
the
poles
of
the
magnet,
save
when
a
current
of
electricity
is
made
to
pass
through
the
wire,
when
the
horseshoe
becoming
magnetic,
the
keeper,
in
spite
of
the
resistance
of
the
spring,
is
brought
down
sharply
into
contact
with
the
poles,
and
so
remains
until
the
circuit
is
again
severed,
when
it
flies
back
again
to
its
former
position.
The
little
metal
knob
or
hammer
c,
which
is
to
produce
the
raps,
is
screwed
to
the
under
side
of
the
keeper,
and
points
between
the
two
arms
or
poles
of
the
magnet.
If,
therefore,
the
magnet
be
fastened
to
a
piece
of
wood,
or
other
hard
surface,
and
an
electric
current
be
sent
through
the
wire,
the
keeper
is
instantly
drawn
down
to
the
poles
of
the
magnet,
and
the
hammer,
moving
with
it,
strikes
the
wood
between
the
poles,
and
produces
the
rap.
As
soon
as
the
circuit
is
broken,
the
keeper
and
hammer
are
raised
by
the
spring,
in
readiness
for
another
rap;
and
each
time
that
connection
with
the
battery
is
made,
a
rap
is
produced.
The
wires
from
the
concealed
magnet
are
made
to
pass
down
the
leg
of
the
table,
and
beneath
the
floor
or
carpet
to
the
hiding-place
of
the
assistant,
who
can
thus
summon
spirits
“from
the
vasty
deep”
or
elsewhere,
at
his
pleasure.
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