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"
It
is
actually
a
manometer
.
But
by
communication
with
the
water
,
whose
external
pressure
it
indicates
,
it
gives
our
depth
at
the
same
time
.
"
"
And
these
other
instruments
,
the
use
of
which
I
can
not
guess
?
"
"
Here
,
Professor
,
I
ought
to
give
you
some
explanations
.
Will
you
be
kind
enough
to
listen
to
me
?
"
He
was
silent
for
a
few
moments
,
then
he
said
:
"
There
is
a
powerful
agent
,
obedient
,
rapid
,
easy
,
which
conforms
to
every
use
,
and
reigns
supreme
on
board
my
vessel
.
Everything
is
done
by
means
of
it
.
It
lights
,
warms
it
,
and
is
the
soul
of
my
mechanical
apparatus
.
This
agent
is
electricity
.
"
"
Electricity
?
"
I
cried
in
surprise
.
"
Yes
,
sir
.
"
"
Nevertheless
,
Captain
,
you
possess
an
extreme
rapidity
of
movement
,
which
does
not
agree
well
with
the
power
of
electricity
.
Until
now
,
its
dynamic
force
has
remained
under
restraint
,
and
has
only
been
able
to
produce
a
small
amount
of
power
.
"
"
Professor
,
"
said
Captain
Nemo
,
"
my
electricity
is
not
everybody
's
.
You
know
what
sea-water
is
composed
of
.
In
a
thousand
grammes
are
found
96
12
per
cent
.
of
water
,
and
about
2
23
per
cent
.
of
chloride
of
sodium
;
then
,
in
a
smaller
quantity
,
chlorides
of
magnesium
and
of
potassium
,
bromide
of
magnesium
,
sulphate
of
magnesia
,
sulphate
and
carbonate
of
lime
.
You
see
,
then
,
that
chloride
of
sodium
forms
a
large
part
of
it
.
So
it
is
this
sodium
that
I
extract
from
the
sea-water
,
and
of
which
I
compose
my
ingredients
.
I
owe
all
to
the
ocean
;
it
produces
electricity
,
and
electricity
gives
heat
,
light
,
motion
,
and
,
in
a
word
,
life
to
the
Nautilus
.
"
"
But
not
the
air
you
breathe
?
"
