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210
The Fairy-Land of Science
·
Arabella B. Buckley
33
But
when
the
sun
is
away,
if
the
night
is
clear
we
have
light
from
the
starts.
Do
these
then
too
make
waves
all
across
the
enormous
distance
between
them
and
us?
Certainly
they
do,
for
they
too
are
suns
like
our
own,
only
they
are
so
far
off
that
the
waves
they
send
are
more
feeble,
and
so
we
only
notice
them
when
the
sun's
stronger
waves
are
away.
But
perhaps
you
will
ask,
if
no
one
has
ever
seen
these
waves
not
the
ether
in
which
they
are
made,
what
right
have
we
to
say
they
are
there?
Strange
as
it
may
seem,
though
we
cannot
see
them
we
have
measured
them
and
know
how
large
they
are,
and
how
many
can
go
into
an
inch
of
space.
For
as
these
tiny
waves
are
running
on
straight
forward
through
the
room,
if
we
put
something
in
their
way,
they
will
have
to
run
round
it;
and
if
you
let
in
a
very
narrow
ray
of
light
through
a
shutter
and
put
an
upright
wire
in
the
sunbeam,
you
actually
make
the
waves
run
round
the
wire
just
as
water
runs
round
a
post
in
a
river;
and
they
meet
behind
the
wire,
just
as
the
water
meets
in
a
V
shape
behind
the
post.
Now
when
they
meet,
they
run
up
against
each
other,
and
here
it
is
we
catch
them.
Fir
if
they
meet
comfortably,
both
rising
up
in
a
good
wave,
they
run
on
together
and
make
a
bright
line
of
light;
but
if
they
meet
higgledy-piggledy,
one
up
and
the
other
down,
all
in
confusion,
they
stop
each
other,
and
then
there
is
no
light
but
a
line
of
darkness.
And
so
behind
your
piece
of
wire
you
can
catch
the
waves
on
a
piece
of
paper,
and
you
will
find
they
make
dark
and
light
lines
one
side
by
side
with
the
other,
and
by
means
of
these
bands
it
is
possible
to
find
out
how
large
the
waves
must
be.
This
question
is
too
difficult
for
us
to
work
it
out
here,
but
you
can
see
that
large
waves
will
make
broader
light
and
dark
bands
than
small
ones
will,
and
that
in
this
way
the
size
of
the
waves
may
be
measured.
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