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The Fairy-Land of Science
·
Arabella B. Buckley
116
Here
we
are
back
again
in
the
land
of
invisible
workers!
We
have
all
been
listening
and
hearing
ever
since
we
were
babies,
but
have
we
ever
made
any
picture
to
ourselves
of
how
sound
comes
to
us
right
across
a
room
or
a
field,
when
we
stand
at
one
end
and
the
person
who
calls
is
at
the
other?
Since
we
have
studied
the
"aerial
ocean,"
we
know
that
the
air
filling
the
space
between
us,
though
invisible,
is
something
very
real,
and
now
all
we
have
to
do
is
to
understand
exactly
how
the
movement
crosses
this
air.
This
we
shall
do
most
readily
by
means
of
an
experiment
made
by
Dr.
Tyndall
in
his
lectures
on
Sound.
I
have
here
a
number
of
boxwood
balls
resting
in
a
wooden
tray
which
has
a
bell
hung
at
the
end
of
it.
I
am
going
to
take
the
end
ball
and
roll
it
sharply
against
the
rest,
and
then
I
want
you
to
notice
carefully
what
happens.
See!
the
ball
at
the
other
end
has
flow
off
and
hit
the
bell,
so
that
you
hear
it
ring.
Yet
the
other
balls
remain
where
they
were
before.
Why
is
this?
It
is
because
each
of
the
balls,
as
it
was
knocked
forwards,
had
one
in
front
of
it
to
stop
it
and
make
it
bound
back
again,
but
the
last
one
was
free
to
move
on.
When
I
threw
this
ball
from
my
hand
against
the
others,
the
one
in
front
of
it
moved,
and
hitting
the
third
ball,
bounded
back
again;
the
third
did
the
same
to
the
fourth,
the
fourth
to
the
fifth,
and
so
on
to
the
end
of
the
line.
Each
ball
thus
came
back
to
its
place,
but
it
passed
the
shock
on
to
the
last
ball,
and
the
ball
to
the
bell.
If
I
now
put
the
balls
close
up
to
the
bell,
and
repeat
the
experiment,
you
still
hear
the
sound,
for
the
last
ball
shakes
the
bell
as
if
it
were
a
ball
in
front
of
it.
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