"All coherent aggregates are perpetually vibrating at a period-frequency corresponding to some harmonic ratio of the fundamental pitch of the vibrating body; this pitch is a multiple of the pitch of the atomole." [Keely, pre1894]

See Also

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Differentiation
Figure 8.5 - Summation Tones
Harmonic
Harmonic Series
Interval
Law of Harmonic Pitch
Law of Harmonic Vibrations
Overtone
Overtone Series
Overtones Developed Musically
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