This table shows how the exact frequencies that a Hammond organ produces are generated. Starting from a driving shaft spinning at exactly 1200 RPM, a pair of gears drives each tone wheel at a suitable rate for the teeth on the wheel to generate the desired wave. The resultant frequencies are neither exactly equal-temperament (only the "A" note is exactly standard pitch) nor exact harmonics of each other, but are close to both. The deviations may contribute to the timbre of chords played on the instrument, however.