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"
That
is
evident
.
"
"
Now
,
if
water
is
not
absolutely
incompressible
,
it
is
at
least
capable
of
very
slight
compression
.
Indeed
,
after
the
most
recent
calculations
this
reduction
is
only
.
000436
of
an
atmosphere
for
each
thirty
feet
of
depth
.
If
we
want
to
sink
3,000
feet
,
I
should
keep
account
of
the
reduction
of
bulk
under
a
pressure
equal
to
that
of
a
column
of
water
of
a
thousand
feet
.
The
calculation
is
easily
verified
.
Now
,
I
have
supplementary
reservoirs
capable
of
holding
a
hundred
tons
.
Therefore
I
can
sink
to
a
considerable
depth
.
When
I
wish
to
rise
to
the
level
of
the
sea
,
I
only
let
off
the
water
,
and
empty
all
the
reservoirs
if
I
want
the
Nautilus
to
emerge
from
the
tenth
part
of
her
total
capacity
.
"
I
had
nothing
to
object
to
these
reasonings
.
"
I
admit
your
calculations
,
Captain
,
"
I
replied
;
"
I
should
be
wrong
to
dispute
them
since
daily
experience
confirms
them
;
but
I
foresee
a
real
difficulty
in
the
way
.
"
"
What
,
sir
?
"
"
When
you
are
about
1,000
feet
deep
,
the
walls
of
the
Nautilus
bear
a
pressure
of
100
atmospheres
.
If
,
then
,
just
now
you
were
to
empty
the
supplementary
reservoirs
,
to
lighten
the
vessel
,
and
to
go
up
to
the
surface
,
the
pumps
must
overcome
the
pressure
of
100
atmospheres
,
which
is
1,500
lbs
.
per
square
inch
.
From
that
a
power
--
--
"
"
That
electricity
alone
can
give
,
"
said
the
Captain
,
hastily
.
"
I
repeat
,
sir
,
that
the
dynamic
power
of
my
engines
is
almost
infinite
.
The
pumps
of
the
Nautilus
have
an
enormous
power
,
as
you
must
have
observed
when
their
jets
of
water
burst
like
a
torrent
upon
the
Abraham
Lincoln
.
Besides
,
I
use
subsidiary
reservoirs
only
to
attain
a
mean
depth
of
750
to
1,000
fathoms
,
and
that
with
a
view
of
managing
my
machines
.
Also
,
when
I
have
a
mind
to
visit
the
depths
of
the
ocean
five
or
six
mlles
below
the
surface
,
I
make
use
of
slower
but
not
less
infallible
means
.
"
"
What
are
they
,
Captain
?
"
"
That
involves
my
telling
you
how
the
Nautilus
is
worked
.
"
