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210
The Fairy-Land of Science
·
Arabella B. Buckley
119
Although
each
atom
of
air
moves
a
very
little
way
forwards
and
then
back,
yet,
as
a
long
row
of
atoms
may
be
crowded
together
before
they
begin
to
part,
a
wave
is
often
very
long.
When
a
man
talks
in
an
ordinary
bass
voice,
he
makes
sound-waves
from
8
to
12
feet
long;
a
woman's
voice
makes
shorter
waves,
from
2
to
4
feet
long,
and
consequently
the
tone
is
higher,
as
we
shall
presently
explain.
And
now
I
hope
that
some
one
is
anxious
to
ask
why,
when
I
clap
my
hands,
anyone
behind
me
or
at
the
side,
can
hear
it
as
well
or
nearly
as
well
as
you
who
are
in
front.
This
is
because
I
give
a
shock
to
the
air
all
round
my
hands,
and
waves
go
out
on
all
sides,
making
as
it
were
gloves
of
crowdings
and
partings
widening
and
widening
away
from
the
clap
as
circles
widen
on
a
pond.
Thus
the
waves
travel
behind
me,
above
me,
and
on
all
sides,
until
they
hit
the
walls,
the
ceiling,
and
the
floor
of
the
room,
and
wherever
you
happen
to
be,
they
hit
upon
your
ear.
Week
17
If
you
can
picture
to
yourself
these
waves
spreading
out
in
all
directions,
you
will
easily
see
why
sound
grows
fainter
at
the
distance.
Just
close
round
my
hands
when
I
clap
them,
there
is
a
small
quantity
of
air,
and
so
the
shock
I
give
it
is
very
violent,
but
as
the
sound-waves
spread
on
all
sides
they
have
more
and
more
air
to
move,
and
so
the
air-atoms
are
shaken
less
violently
and
strike
with
less
force
on
your
ear.
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