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281
Heroes of the Telegraph
·
John Munro
244
Now
it
occurred
to
Professor
Hughes
that,
if
this
were
so,
it
might
be
possible
to
cause
the
air-vibrations
of
sound
to
so
act
upon
a
wire
conveying
a
current
as
to
stretch
and
contract
it
in
sympathy
with
themselves,
so
that
the
sound-waves
would
create
corresponding
electric
waves
in
the
current,
and
these
electric
waves,
passed
through
a
telephone
connected
to
the
wire,
would
cause
the
telephone
to
give
forth
the
original
sounds.
He
first
set
about
trying
the
effect
of
vibrating
a
wire
in
which
a
current
flowed,
to
see
if
the
stretching
and
compressing
thereby
produced
would
affect
the
current
so
as
to
cause
sounds
in
a
telephone
connected
up
in
circuit
with
the
wire--but
without
effect.
He
could
hear
no
sound
whatever
in
the
telephone.
Then
he
stretched
the
wire
till
it
broke
altogether,
and
as
the
metal
began
to
rupture
he
heard
a
distinct
grating
in
the
telephone,
followed
by
a
sharp
'click,'
when
the
wire
sundered,
which
indicated
a
'rush'
of
electricity
through
the
telephone.
This
pointed
out
to
him
that
the
wire
might
be
sensitive
to
sound
when
in
a
state
of
fracture.
Acting
on
the
hint,
he
placed
the
two
broken
ends
of
the
wire
together
again,
and
kept
them
so
by
the
application
of
a
definite
pressure.
To
his
joy
he
found
that
he
had
discovered
what
he
had
been
in
search
of.
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