This Foucault's Pendulum Apparatus is a carefully constructed miniature version of Foucault's device. This precise, electrically maintained model shows the Earth's rotation and is an ideal display for a science room. Since the forces causing the precession are small, the effect is easily disturbed by other small environmental forces. To eliminate drafts, the pendulum is enclosed in a glass case and the heavy vibration-damping base is equipped with leveling feet. The pendulum is electrically maintained to counter air resistance damping and the swing amplitude can be adjusted using a potentiometer.