This experiment is not a case of pure balancing, but depends principally
upon the nice adjustment of the two pieces of stick by means of which
the position of the two glasses is maintained. A couple of slender
pen-holders may be used, and must be trimmed down at the ends until the
right length is obtained. The position of the sticks and the manner in
which the glasses are supported can best be gathered by a study of the
illustration below.
[Illustration]