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378
The Story of the Atlantic Telegraph
·
Henry M. Field
168
"Throughout
the
greater
portion
of
Monday
morning
the
electrical
signals
from
the
Niagara
had
been
getting
gradually
weaker,
until
they
ceased
altogether
for
nearly
three-quarters
of
an
hour.
Our
uneasiness,
however,
was
in
some
degree
lessened
by
the
fact
that
the
stoppage
appeared
to
be
a
want
of
continuity,[B]
and
not
any
defect
in
insulation,
and
there
was
consequently
every
reason
to
suppose
that
it
might
arise
from
faulty
connection
on
board
the
Niagara.
Accordingly
Professor
Thomson
sent
a
message
to
the
effect
that
the
signals
were
too
weak
to
be
read,
and,
as
if
they
had
been
awaiting
such
a
signal
to
increase
their
battery
power,
the
deflections
immediately
returned
even
stronger
than
they
had
ever
been
before.
Toward
the
evening,
however,
they
again
declined
in
force
for
a
short
time.
With
the
exception
of
these
little
stoppages,
the
electrical
condition
of
the
submerged
wire
seemed
to
be
much
improved.
It
was
evident
that
the
low
temperature
of
the
water
at
the
immense
depth
improved
considerably
the
insulating
properties
of
the
gutta-percha,
while
the
enormous
pressure
to
which
it
must
have
been
subjected
probably
tended
to
consolidate
its
texture,
and
to
fill
up
any
air-bubbles
or
slight
faults
in
manufacture
which
may
have
existed.
"The
weather
during
Monday
night
moderated
a
little,
but
still
there
was
a
very
heavy
sea
on,
which
endangered
the
wire
every
second
minute.
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