Figure 8.6 - Difference Tones
Ramsay
A grave harmonic is a secondary note which spontaneously arises when two different notes are sounded together. It is a note whose mathematical number is the difference of the two which awaken it; e.g., F2 and C3, the interval of the fifth, awakens a grave harmonic whose number is 1, which is the difference of 2 and 3; and this 1 strengthens F2, for it is its lower octave. But the interval of F2 and F4, or any other octave, does not awaken a grave harmonic, since there is no difference-number between the two. - Editor. [Scientific Basis and Build of Music, page 36]
See Also
Difference Tone
Figure 8.5 - Summation Tones
grave harmonic
Harmonic
Interval
Law of Harmonic Pitch
Law of Harmonic Vibrations
LAW OF SUPERPOSITION
Overtone
Overtone Series
Overtones Developed Musically
Power of Beat Harmonics
Resultant Tone
Undertone
1.23 - Power of Harmonics through Summation Tones
9.9 - Sympathy or Harmony Between Harmonics or Overtones