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
3C20.16
Steel spring pendulum, inverted, vibrates at 10 Hz. 3C20.40
Savart's wheel: Toothed wheel and cardboard or air jet. 3C20.30
Siren: large, electric motor driven. 3C20.30
Compressed air jet blows through spinning disk with holes. 3C20.15
Galton's whistle: Compressed air whistle. 3C20.16
Limit of audibility: Set of rods that ring at different frequencies.
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+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+55
Casio electronic synthesizer with amp and speaker. B+45+41
Feedback from microphone/speaker system. B+45+51
Helmholtz Resonators with tuning forks and a candle B+45+60
Applet: Vibrational Behavior of an Empty Beer Bottle B+45+65
Applet: Vibrational Modes of a Tuning Fork