Guitar It is flat on classical guitars and slightly curved crosswise on acoustic and electric guitars. The curvature of the fretboard is measured by the fretboard radius, which is the radius of a hypothetical circle of which the fretboard's surface constitutes a segment. The smaller the fretboard radius, the more noticeably curved the fretboard is. Most modern guitars feature a 12" neck radius, while older guitars from the 1960s and 1970s usually feature a 6-8" neck radius. Pinching a string against a fret on fretboard effectively shortens the vibrating length of the string, producing a higher pitch. Fretboards are most commonly
Romantic guitar Gagliano in Naples. This guitar, which was displayed in the Heyer Museum, Cologne before that museum was dispersed, showed some important differences from the modern classical guitar. It had 5 single strings, inlaid brass frets, a long neck relative to string length (the fretboard meeting the body at the 11th fret), a pegged bridge and a characteristic figure-8 shaped tuning head. It lacked only a sixth string to make it identical with the early romantic guitar. The earliest extant six-string guitar was built in 1779 by Gaetano Vinaccia (1759 – after 1831) in Naples, Italy. The Vinaccia family of luthiers