Sprockets on shaft rotate against a card to make sound.
3C20.40 • B+45+35
Card pushed against rotating toothed wheels makes sounds. A paper card is pressed against one of the toothed wheels, generating a sound. The frequency of the sound increases with the number of teeth on a wheel, and the motor speed.
Related Demos
3C20.15 Galton's whistle: Compressed air whistle. 3C20.16 Steel spring pendulum, inverted, vibrates at 10 Hz. 3C20.16 Limit of audibility: Set of rods that ring at different frequencies. 3C20.30 Siren: large, electric motor driven. 3C20.30 Compressed air jet blows through spinning disk with holes. 3C20.40 Savart's wheel: Toothed wheel and cardboard or air jet.
B+45+0 Steel spring pendulum, inverted, vibrates at 10 Hz. B+45+5 Giant tuning fork, barely audible, displayed with stroboscope. B+45+10 Ultrasound transducers (40 kHz) as both sources and receivers. B+45+15 Bell ringing in a jar evacuated with pump. B+45+20 Savart's wheel: Toothed wheel and cardboard or air jet. B+45+25 Siren: large, electric motor driven. B+45+30 Compressed air jet blows through spinning disk with holes. B+45+32 Twirling Tube B+45+40 Caruga horn: Varigated tube to blow through B+45+41 Feedback from microphone/speaker system. B+45+42 Hoot Tube B+45+45 Galton's whistle: Compressed air whistle. B+45+50 Helmholtz resonators drive radiometer vanes, using tuning forks. B+45+51 Helmholtz Resonators with tuning forks and a candle B+45+55 Casio electronic synthesizer with amp and speaker. B+45+60 Applet: Vibrational Behavior of an Empty Beer Bottle B+45+65 Applet: Vibrational Modes of a Tuning Fork