Pedagogical equipment for study of the pendular motion comprises a vertical plate with angular scale on the edge, a wire is fixed on a drum, going through a hollow guide and having an hook to attach a chosen weight

摘要

Equipment comprises a vertical plate (10) with angular scale on the edge, a wire drum (20) and a wire guide (30) mounted on the plate. The wire is fixed on the drum, goes through the hollow guide (32) and has an hook (40) attached to its free end. The hook can link the wire (50) to a chosen weight (100).