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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
644
ELECTRICAL
TRICKS.--Some
of
the
most
mysterious
of
the
stage
tricks
are
performed
by
means
of
electricity,
or,
to
speak
more
correctly,
of
electro-magnetism.
In
describing
these,
which
are
nearly
all
attributable
to
the
inventive
genius
of
Robert-Houdin,
it
may
be
desirable,
in
the
first
place,
to
explain
in
a
few
words
what
electro-magnetism
is,
and
how
it
operates.
Every
school-boy
is
acquainted
with
the
ordinary
steel
horseshoe
magnet,
and
knows
that
if
the
accompanying
small
iron
bar,
or
“keeper,”
is
placed
within
a
short
distance
from
its
ends
or
“poles,”
it
will
be
sharply
attracted
to
them.
In
the
case
of
the
ordinary
magnet
this
attractive
force
is
permanent,
but
in
that
of
the
electro-magnet
it
may
be
produced
or
destroyed
at
pleasure.
The
electro-magnet
consists
of
a
short
piece
of
soft
iron,
(either
straight,
or
bent
into
a
horseshoe
form),
with
copper
wire
(covered
with
silk
or
cotton)
wound
round
and
round
it
nearly
to
the
ends.
If
a
current
of
electricity
from
a
galvanic
battery
is
made
to
pass
through
this
wire,
the
iron
core
becomes
powerfully
magnetic,
the
attractive
force,
however,
ceasing
as
soon
as
the
current
is
interrupted.
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