Movable Frets
In order to perfectly solve all intonation problems of guitars; or allow guitarists to use a variety of different musical temperaments (or to play microtonal music) it is necessary for the frets on the guitar to be adjustable. Work in this field has already been done in the 19th century, when Thomas Perronet Thompson (1783–1869) wrote a work on the "Enharmonic Guitar", with ideas which were used by Panormo. Lacote also built a "guitare enharmonique" with movable frets.
The luthier Walter J. Vogt (1935–1990) developed a contemporary mechanism with movable frets, now also used by other luthiers e.g. Herve R. Chouard. Tolgahan Cogulu has also designed an "adjustable microtonal guitar" in 2008, based on Vogt's design.
Other concepts for changeable frets, include removable detachable fingerboards: "switchboards".
See also: article "Just guitar" by John Schneider
Read more about this topic: Classical Guitar Making
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