Tuning Fork - Adjustable Sympathetic - Set of 2The classic example is demonstrated with two similar tuning forks of which one is mounted on a wooden box. If the other one is struck and then placed on the box, then muted, the un struck mounted fork will be heard. In similar fashion, strings will respond to the external vibrations of a tuning fork when sufficient harmonic relations exist between the respective vibratory modes. A unison or octave will provoke the largest response as there is maximum