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210
The Fairy-Land of Science
·
Arabella B. Buckley
35
But
we
do
not
yet
know
all
about
our
sunbeams.
See,
I
have
here
a
piece
of
glass
with
three
sides,
called
a
prism.
If
I
put
it
in
the
sunlight
which
is
streaming
through
the
window,
what
happens?
Look!
on
the
table
there
is
a
line
of
beautiful
colours.
I
can
make
it
long
or
short,
as
I
turn
the
prism,
but
the
colours
always
remain
arranged
in
the
same
way.
Here
at
my
left
hand
is
the
red,
beyond
it
orange,
then
yellow,
green,
blue,
indigo
or
deep
blue,
and
violet,
shading
one
into
the
other
all
along
the
line.
We
have
all
seen
these
colours
dancing
on
the
wall
when
the
sun
has
been
shining
brightly
on
the
cut-glass
pendants
of
the
chandelier,
and
you
may
see
them
still
more
distinctly
if
you
let
a
ray
of
light
into
a
darkened
room,
and
pass
it
through
the
prism
as
in
the
diagram
(Fig.
7).
What
are
these
colours?
Do
they
come
from
the
glass?
No;
for
you
will
remember
to
have
seen
them
in
the
rainbow,
and
in
the
soap-
bubble,
and
even
in
a
drop
of
dew
or
the
scum
on
the
top
of
a
pond.
This
beautiful
coloured
line
is
only
our
sunbeam
again,
which
has
been
split
up
into
many
colours
by
passing
through
the
glass,
as
it
is
in
the
rain-drops
of
the
rainbow
and
the
bubbles
of
the
scum
of
the
pond.
Week
5
Till
now
we
have
talked
of
the
sunbeam
as
if
it
were
made
of
only
one
set
of
waves
of
different
sizes,
all
travelling
along
together
from
the
sun.
These
various
waves
have
been
measured,
and
we
know
that
the
waves
which
make
up
red
light
are
larger
and
more
lazy
than
those
which
make
violet
light,
so
that
there
are
only
thirty-nine
thousand
red
waves
in
an
inch,
while
there
are
fifty-seven
thousand
violet
waves
in
the
same
space.
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