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1
378
The Story of the Atlantic Telegraph
·
Henry M. Field
60
The
only
exception
to
this
uniform
depth,
lies
about
two
hundred
miles
off
the
coast
of
Ireland,
where
within
a
space
of
about
a
dozen
miles,
the
depth
sinks
from
five
hundred
and
fifty
to
seventeen
hundred
and
fifty
fathoms!
"In
14
deg.
48'
west,"
says
Dayman,
"we
have
five
hundred
and
fifty
fathoms
rock,
and
in
15
deg.
6'
west
we
have
seventeen
hundred
and
fifty
fathoms
ooze.
This
is
the
greatest
dip
in
the
whole
ocean."
"In
little
more
than
ten
miles
of
distance
a
change
of
depth
occurs,
amounting
to
seventy-two
hundred
feet."
This
is
indeed
a
tremendous
plunge
from
the
hard
rock
into
the
slime
of
the
sea.
The
same
sharp
declivity
was
noticed
by
Berryman,
and
has
been
observed
in
the
several
attempts
to
lay
the
cable.
Thus
in
the
second
expedition
of
1858,
as
the
Agamemnon
was
approaching
the
coast
of
Ireland,
we
read
in
the
report
of
her
voyage:
"About
five
o'clock
in
the
evening,
the
steep
submarine
mountain
which
divides
the
telegraphic
plateau
from
the
Irish
coast,
was
reached;
and
the
sudden
shallowing
of
the
water
had
a
very
marked
effect
on
the
cable,
causing
the
strain
on,
and
the
speed
of
it,
to
lessen
every
minute.
A
great
deal
of
slack
was
paid
out
to
allow
for
inequalities
which
might
exist,
though
undiscovered
by
the
sounding-line."
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