3C50.31 Helmholtz resonator 19-4.6 Sound from a loudspeaker is directed at a series of Helmholtz resonators with pinwheel detectors at their small apertures. A pistol is fired in front of a set of tuning fork resonance boxes equipped with inductive pickups. A complex setup to plot the frequency spectrum of a box. S-117 Use a fake larynx to talk without using the vocal cords. 3C50.35 resonance tube spectrum PIRA 1000 3C50.35 resonance tube spectrum 3C50.35 Drive a speaker at one end of a tube with the swept frequency output of a spectrum analyzer.
Interesting additions are end corrections, tone holes, and adding a bell.
Feed a oscillator or other sound to any one of four different types of horns to show differences in quality at various frequencies. PIRA 1000 3C50.40 string resonance spectra on oscillo. Use a steel wire and guitar pickup. A generator with an adjustable high Q bandpass filter allows one to train the ear to pick out the harmonics of a complex sound. The circuit diagram for the Gronseth device.