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210
The Fairy-Land of Science
·
Arabella B. Buckley
43
Before
I
began
this
lecture,
I
put
a
piece
of
paper,
which
had
been
dipped
in
nitrate
of
silver,
under
a
piece
of
glass;
and
between
it
and
the
glass
I
put
a
piece
of
lace.
Look
what
the
sun
has
been
doing
while
I
have
been
speaking.
It
has
been
breaking
up
the
nitrate
of
silver
on
the
paper
and
turning
it
into
a
deep
brown
substance;
only
where
the
threads
of
the
lace
were,
and
the
sun
could
not
touch
the
nitrate
of
silver,
there
the
paper
has
remained
light-coloured,
and
by
this
means
I
have
a
beautiful
impression
of
the
lace
on
the
paper.
I
will
now
dip
the
impression
into
water
in
which
some
hyposulphite
of
soda
is
dissolved,
and
this
will
"fix"
the
picture,
that
is,
prevent
the
sun
acting
upon
it
any
more;
then
the
picture
will
remain
distinct,
and
I
can
pass
it
round
to
you
all.
Here,
again,
invisible
waves
have
been
at
work,
and
this
time
neither
as
light
nor
as
heat,
but
as
chemical
agents,
and
it
is
these
waves
which
give
us
all
our
beautiful
photographs.
In
any
toyshop
you
can
buy
this
prepared
paper,
and
set
the
chemical
waves
at
work
to
make
pictures.
Only
you
must
remember
to
fix
it
in
the
solution
afterwards,
otherwise
the
chemical
rays
will
go
on
working
after
you
have
taken
the
lace
away,
and
all
the
paper
will
become
brown
and
your
picture
will
disappear.
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