Definition: A wheel which regulates the beats or pulses of a watch
or chronometer, answering to the pendulum of a clock; -- often called
simply a balance.
Definition: A ratchet-shaped scape wheel, which in some watches is
acted upon by the axis of the balance wheel proper (in those watches
called a balance).
Definition: A wheel which imparts regularity to the movements of
any engine or machine; a fly wheel.
