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378
The Story of the Atlantic Telegraph
·
Henry M. Field
55
To
make
our
knowledge
of
the
sea
complete,
one
thing
more
was
wanting--a
method
not
only
of
reaching
the
bottom,
but
of
laying
hold
of
it,
and
bringing
it
up
to
the
light
of
day.
This
was
now
to
be
supplied.
It
is
to
the
inventive
genius
of
a
lieutenant
of
the
United
States
navy,
Mr.
J.
M.
Brooke,
that
the
world
owes
the
means
of
finding
out
what
is
at
the
bottom
of
the
sea.
This
is
by
a
very
simple
contrivance,
by
which
the
heavy
weight,
used
to
sink
the
measuring
line,
is
detached
as
soon
as
it
strikes
bottom,
leaving
the
line
free
so
that
it
can
be
drawn
up
lightly
and
quickly
to
the
surface
without
danger
of
breaking.
Below
the
weight,
and
driven
by
it
into
the
ooze,
is
a
rod,
in
which
is
an
open
valve,
that
now
closes
with
a
spring,
by
which
it
catches
a
cupful
of
the
soil,
which
is
thus
brought
up
to
the
surface,
to
be
placed
under
the
microscope,
and
be
subjected
to
the
sharp
eye
of
science.
With
this
simple
instrument
the
skilful
seaman
explores
the
bottom
of
the
ocean
by
literally
feeling
over
it.
With
a
long
line
he
dives
to
the
very
lowest
depths,
while
the
clasp
at
the
end
of
it
is
like
the
tip
of
the
elephant's
trunk,
serving
as
a
delicate
finger
with
which
he
picks
up
sand
and
shells
that
lie
strewn
on
the
floor
of
the
deep.
What
important
conclusions
are
derived
from
this
inspection
of
the
bottom
of
the
sea,
is
well
stated
by
Lieutenant
Maury
in
the
letter
already
quoted.
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