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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
650
To
describe
completely
the
“induction
coil,”
above
referred
to,
would
be
beyond
the
scope
of
the
present
treatise.
It
may,
however,
be
summarily
described
as
consisting
of
a
coil
of
insulated
copper
wire,
wound
round
a
small
bundle
of
straight
iron
wires,
say
five
or
six
inches
in
length,
and
an
inch
in
diameter.
This
is
called
the
“primary”
coil.
Round
this
is
again
wound
a
quantity
of
much
finer
wire,
also
insulated.
This
constitutes
the
“secondary”
coil.
The
ends
of
each
coil
are
kept
free.
If
a
current
of
electricity
be
made
to
circulate
through
the
wire
of
the
primary
coil,
an
independent
current
of
great
intensity
is
found
to
be
thereby
produced,
by
a
mysterious
process
called
induction,
in
the
secondary
coil.
This
current
is
strongest
at
the
moment
of
first
completing
the
circuit
in
the
primary
wire,
and
if
a
person
is
grasping
the
ends
of
the
secondary
wire,
or
any
conducting
substance
in
connection
with
it,
at
the
moment
when
the
circuit
is
completed,
he
will
receive
a
very
severe
shock.
A
contrivance
is
attached
to
the
coil,
whereby
the
circuit
is
made
and
broken
alternately
with
great
rapidity,
thereby
producing
a
continuous
shock,
of
such
power
that
the
victim
loses
for
the
time
being
the
faculty
of
relaxing
his
muscles,
and
is
compelled,
after
the
manner
of
the
unfortunate
Arab,
to
grip,
tighter
and
tighter,
the
cause
of
his
pain,
until
released
by
the
final
severing
of
the
circuit.
Any
reader
who
desires
a
more
complete
acquaintance
with
the
induction
coil,
should
purchase
a
little
shilling
manual,
entitled,
“Intensity
Coils,
How
Made
and
How
Used,”
by
“Dyer”
(Suter,
Alexander,
and
Co.,
Cheapside),
where
he
will
find
an
excellent
account
of
this
interesting
subject.
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