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Taking
some
azotic
acid
,
he
mixed
it
with
glycerine
,
which
had
been
previously
concentrated
by
evaporation
,
subjected
to
the
water-bath
,
and
he
obtained
,
without
even
employing
a
refrigerant
mixture
,
several
pints
of
an
oily
yellow
mixture
.
This
last
operation
Cyrus
Harding
had
made
alone
,
in
a
retired
place
,
at
a
distance
from
the
Chimneys
,
for
he
feared
the
danger
of
an
explosion
,
and
when
he
showed
a
bottle
of
this
liquid
to
his
friends
,
he
contented
himself
with
saying
,
--
"
Here
is
nitro-glycerine
!
"
It
was
really
this
terrible
production
,
of
which
the
explosive
power
is
perhaps
tenfold
that
of
ordinary
powder
,
and
which
has
already
caused
so
many
accidents
.
However
,
since
a
way
has
been
found
to
transform
it
into
dynamite
,
that
is
to
say
,
to
mix
with
it
some
solid
substance
,
clay
or
sugar
,
porous
enough
to
hold
it
,
the
dangerous
liquid
has
been
used
with
some
security
.
But
dynamite
was
not
yet
known
at
the
time
when
the
settlers
worked
on
Lincoln
Island
.
"
And
is
it
that
liquid
that
is
going
to
blow
up
our
rocks
?
"
said
Pencroft
incredulously
.
"
Yes
,
my
friend
,
"
replied
the
engineer
,
"
and
this
nitro-glycerine
will
produce
so
much
the
more
effect
,
as
the
granite
is
extremely
hard
,
and
will
oppose
a
greater
resistance
to
the
explosion
.
"
"
And
when
shall
we
see
this
,
captain
?
"
"
To-morrow
,
as
soon
as
we
have
dug
a
hole
for
the
mine
,
replied
the
engineer
.
"
The
next
day
,
the
21st
of
May
,
at
daybreak
,
the
miners
went
to
the
point
which
formed
the
eastern
shore
of
Lake
Grant
,
and
was
only
five
hundred
feet
from
the
coast
.
At
this
place
,
the
plateau
inclined
downwards
from
the
waters
,
which
were
only
restrained
by
their
granite
case
.
Therefore
,
if
this
case
was
broken
,
the
water
would
escape
by
the
opening
and
form
a
stream
,
which
,
flowing
over
the
inclined
surface
of
the
plateau
,
would
rush
on
to
the
beach
.
Consequently
,
the
level
of
the
lake
would
be
greatly
lowered
,
and
the
opening
where
the
water
escaped
would
be
exposed
,
which
was
their
final
aim
.