This is an elaboration of the experiment described in paragraph 4. A
pencil is first thrust through the centre of a cork and two forks into
the sides of the cork. This will permit of the pencil being balanced
horizontally, as in Fig. 11. A second pencil is balanced by the
insertion of two pen-holders in positions relatively similar to those
which the forks bear to the balanced object in Experiments 1, 2, and 3,
and so arranged it may be balanced upon the unsupported end of the first
pencil. The whole structure may be made to revolve upon the needle.
[Illustration]