Twist sympathetic nerve

On a musical instrument with cords, the cords sympathetic nerves are free cords, on which one exerts no action, but which enters in vibrations by simple Résonance - by sympathy - with the played notes of the same height (frequency).

This phenomenon can occur on the rubbed cords , struck pinches or . The sound of these instruments is thus more ventilated and gives the impression of reverberation - acoustic resonant of a place.

They are usually metal cords, because this type of cord has a potential of resonance higher than the cords in bowel. However, one can regard as cords sympathetic nerves the bumblebees in bowel being reproduced on certain instruments like the lirone or the will read da braccio .

The cords sympathetic nerves out of metal pass on a autonomous rest, but to a different height, below the other cords. They are often fixed on the head of the instrument lengthened to accommodate supernumerary ankles. Other systems coexisted:

Fixing by points in top of the instrument, and agreement on ankles placed in the cleat, with the bottom of the case of resonance;
Fixing under the key, with a system of agreement to the bottom of the case.

There is habit to call the string instruments sympathetic nerves of the “instruments of love”. However, it would be righter to name them “instruments ale inglese”, English having the reputation, as of the 17th century, to have invented the process. One however finds it described at Glaréan at the 16th century. Let us note finally that any not choked metal cord becomes a cord sympathetic nerve on a Clavecin or a Clavicorde. The process was thus known by far.

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