"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

**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**