Apparatus:
self-contained
Description:
Shows
Vacuum
in
an
interesting
way.
The
water
inside
the
glass
tube
falls,
sounding
like
a
hammer
hitting
a
nail
upon
impact.
This
demonstration
is
best
practiced
beforehand,
as
the
technique
is
tricky.
The
hammer
must
be
held
at
an
angle
and
the
water
still
before
hammering.
PIRA 1F30.21