[Illustration]
A further application of similar principles, and a plate may be balanced
and spun upon the needle-point. The corked bottle with the needle in
position remains as before. Two other corks are taken and split into two
by a vertical cut. Into one end of each half-cork, upon the flat side,
are stuck the prongs of a fork, and thus the four forks are hung at
equal distances around the edge of the plate. Then, with a little care,
the plate will be held in perfect equilibrium, as in Fig. 5.