 To solve all guitar intonation problems, or help guitarists use different musical temperaments (or to play microtonal music) it is necessary for the frets on the guitar to be adjustable.Work in this field began in the 19th century, when Thomas Perronet Thompson (1783–1869) wrote a work on the "Enharmonic Guitar", with ideas used by Panormo.Lacôte also built a "guitare enharmonique" with movable frets.