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210
The Fairy-Land of Science
·
Arabella B. Buckley
117
Now
imagine
these
balls
to
be
atoms
of
air,
and
the
bell
your
ear.
If
I
clap
my
hands
and
so
hit
the
air
in
front
of
them,
each
air-atom
hits
the
next
just
as
the
balls
did,
and
though
it
comes
back
to
its
place,
it
passes
the
shock
on
along
the
whole
line
to
the
atom
touching
the
drum
of
your
ear,
and
so
you
receive
a
blow.
But
a
curious
thing
happens
in
the
air
which
you
cannot
notice
in
the
balls.
You
must
remember
that
air
is
elastic,
just
as
if
there
were
springs
between
the
atoms
as
in
the
diagram,
Fig.
31,
and
so
when
any
shock
knocks
the
atoms
forward,
several
of
them
can
be
crowded
together
before
they
push
on
those
in
front.
Then,
as
soon
as
they
have
passed
the
shock
on,
they
rebound
and
begin
to
separate
again,
and
so
swing
to
and
fro
till
they
come
to
rest.
meanwhile
the
second
set
will
go
through
just
the
same
movements,
and
will
spring
apart
as
soon
as
they
have
passed
the
shock
on
to
a
third
set,
and
so
you
will
have
one
set
of
crowded
atoms
and
one
set
of
separated
atoms
alternately
all
along
the
line,
and
the
same
set
will
never
be
crowded
two
instants
together.
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