The Artificial Harmonics reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Artificial Harmonics

To produce an artificial harmonic, a guitarist holds down a note on the neck with her left hand, thereby shortening the vibrational length of the string, and uses her right hand to lightly touch a point on the string that is an integer divisor of its vibrational length, and also pluck the side of the string that is closer to the bridge. This technique is used to produce harmonic tones that are otherwise inaccessible on the instrument.

This technique, like true harmonics, works by canceling out the fundamental tone and one or more partial tones by deadening their modes of vibration.

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