Text: Resonance or Co-vibration is the name given to the phenomenon of one vibrating body imparting its vibratory movement to another body, previously at rest. To obtain the maximum resonance two conditions are essential: 1) The two bodies must be in exact unison; that is to say, they must be capable of executing precisely the same number of vibrations in the same time. 2) A certain period of time must be allowed for the exciting body to impress its vibrations on the other. Hand Book of Acoustics, 5th edition J. Curwen & Sons, London, 1903?

See Also:

Source: 68