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210
The Fairy-Land of Science
·
Arabella B. Buckley
55
Even
if
I
lay
the
paper
on
the
table
this
is
still
true,
because
there
is
always
some
air
under
it.
If,
however,
I
could
get
the
air
quite
away
from
one
side
of
the
paper,
then
the
pressure
on
the
other
side
would
show
itself.
I
can
do
this
by
simply
wetting
the
paper
and
letting
it
fall
on
the
table,
and
the
water
will
prevent
any
air
from
getting
under
it.
Now
see!
if
I
try
to
lift
it
by
the
thread
in
the
middle,
I
have
great
difficulty,
because
the
whole
15
pounds'
weight
of
the
atmosphere
is
pressing
it
down.
A
still
better
way
of
making
the
experiment
is
with
a
piece
of
leather,
such
as
the
boys
often
amuse
themselves
with
in
the
streets.
This
piece
of
leather
has
been
well
soaked.
I
drop
it
on
the
floor
and
see!
it
requires
all
my
strength
to
pull
it
up.
(In
fastening
the
string
to
the
leather
the
hole
must
be
very
small
and
the
know
as
flat
as
possible,
and
it
is
even
well
to
put
a
small
piece
of
kid
under
the
knot.
When
I
first
made
this
experiment,
not
having
taken
these
precautions,
it
did
not
succeed
well,
owing
to
air
getting
in
through
the
hole.)
I
now
drop
it
on
this
stone
weight,
and
so
heavily
is
it
pressed
down
upon
it
by
the
atmosphere
that
I
can
lift
the
weight
without
its
breaking
away
from
it.
Have
you
ever
tried
to
pick
limpets
off
a
rock?
If
so,
you
know
how
tight
they
cling.
the
limpet
clings
to
the
rock
just
in
the
same
way
as
this
leather
does
to
the
stone;
the
little
animal
exhausts
the
air
inside
it's
shell,
and
then
it
is
pressed
against
the
rock
by
the
whole
weight
of
the
air
above.
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