Oscillations and Waves > Acoustics > Pitch DCS# 3C20.40

SAVART'S WHEELS


APPARATUS
savart's wheels 202-07-D3
motor 202-07-E
stiff card 111
wooden horn 202-07-C


DESCRIPTION
These sets of toothed wheels are used to demonstrate the relationship between pitch and frequency.  Hold a card against the teeth of the spinning wheels and a chord can be heard.  For one set, the ratio of number of teeth per wheel is 4:5:6:8 which is the same as the ratio of the frequencies in a major chord.  The other set produces a minor chord.