"Any aggregate in a state of vibration develops in addition to its fundamental pitch a series of vibration in symmetrical sub-multiple portions of itself, bearing ratios of one, two, three or more times its fundamental pitch." [Keely, pre 1894]

See Harmonic Series, Overtone Series and Principles of Acoustics.

See Also

Differentiation
Figure 8.5 - Summation Tones
Figure 8.6 - Difference Tones
Harmonic
Harmonic Series
harmonicity
Harmony
Interval
Law of Harmonic Pitch
Law of Harmonic Vibrations
Overtone
Overtone Series
Overtones Developed Musically
Principles of Acoustics
Resultant Tone
Scale
Sympathetic Vibration
Sympathy
Undertone
1.23 - Power of Harmonics through Summation Tones
9.8 - Spontaneous Creation of Harmonic Series
9.9 - Sympathy or Harmony Between Harmonics or Overtones