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These
different
works
lasted
a
week
.
They
were
finished
before
the
transformation
of
the
sulphuret
into
sulphate
of
iron
had
been
accomplished
.
During
the
following
days
the
settlers
had
time
to
construct
a
furnace
of
bricks
of
a
particular
arrangement
,
to
serve
for
the
distillation
of
the
sulphate
or
iron
when
it
had
been
obtained
.
All
this
was
finished
about
the
18th
of
May
,
nearly
at
the
time
when
the
chemical
transformation
terminated
.
Gideon
Spilett
,
Herbert
,
Neb
,
and
Pencroft
,
skillfully
directed
by
the
engineer
,
had
become
most
clever
workmen
.
Before
all
masters
,
necessity
is
the
one
most
listened
to
,
and
who
teaches
the
best
.
When
the
heap
of
pyrites
had
been
entirely
reduced
by
fire
,
the
result
of
the
operation
,
consisting
of
sulphate
of
iron
,
sulphate
of
alumina
,
flint
,
remains
of
coal
,
and
cinders
was
placed
in
a
basinful
of
water
.
They
stirred
this
mixture
,
let
it
settle
,
then
decanted
it
,
and
obtained
a
clear
liquid
containing
in
solution
sulphate
of
iron
and
sulphate
of
alumina
,
the
other
matters
remaining
solid
,
since
they
are
insoluble
.
Lastly
,
this
liquid
being
partly
evaporated
,
crystals
of
sulphate
of
iron
were
deposited
,
and
the
not
evaporated
liquid
,
which
contained
the
sulphate
of
alumina
,
was
thrown
away
.
Cyrus
Harding
had
now
at
his
disposal
a
large
quantity
of
these
sulphate
of
iron
crystals
,
from
which
the
sulphuric
acid
had
to
be
extracted
.
The
making
of
sulphuric
acid
is
a
very
expensive
manufacture
.
Considerable
works
are
necessary
--
a
special
set
of
tools
,
an
apparatus
of
platina
,
leaden
chambers
,
unassailable
by
the
acid
,
and
in
which
the
transformation
is
performed
,
etc.
.
The
engineer
had
none
of
these
at
his
disposal
,
but
he
knew
that
,
in
Bohemia
especially
,
sulphuric
acid
is
manufactured
by
very
simple
means
,
which
have
also
the
advantage
of
producing
it
to
a
superior
degree
of
concentration
.
It
is
thus
that
the
acid
known
under
the
name
of
Nordhausen
acid
is
made
.
To
obtain
sulphuric
acid
,
Cyrus
Harding
had
only
one
operation
to
make
,
to
calcine
the
sulphate
of
iron
crystals
in
a
closed
vase
,
so
that
the
sulphuric
acid
should
distil
in
vapor
,
which
vapor
,
by
condensation
,
would
produce
the
acid
.
The
crystals
were
placed
in
pots
,
and
the
heat
from
the
furnace
would
distil
the
sulphuric
acid
.
The
operation
was
successfully
completed
,
and
on
the
20th
of
May
,
twelve
days
after
commencing
it
,
the
engineer
was
the
possessor
of
the
agent
which
later
he
hoped
to
use
in
so
many
different
ways
.
Now
,
why
did
he
wish
for
this
agent
?
Simply
to
produce
azotic
acid
;
and
that
was
easy
,
since
saltpeter
,
attacked
by
sulphuric
acid
,
gives
azotic
,
or
nitric
,
acid
by
distillation
.
But
,
after
all
,
how
was
he
going
to
employ
this
azotic
acid
?
His
companions
were
still
ignorant
of
this
,
for
he
had
not
informed
them
of
the
result
at
which
he
aimed
.
However
,
the
engineer
had
nearly
accomplished
his
purpose
,
and
by
a
last
operation
he
would
procure
the
substance
which
had
given
so
much
trouble
.
