Four toothed wheels (40, 50, 60, 80 teeth) of acrylic permanently mounted on a single common axis (D=10 mm), sounds are generated by touching the rotating wheels with a piece of cardboard, dimensions: D=60 mm, L=150 mm
Experiment(e) – aus der Versuchsanleitung P9102-5A Akustik, Schwingungen und Wellen, Demo (DEU)