The compensated classical guitar nut.
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2 Middleton Road, 
London E8 4BL, 
United Kingdom
Phone 44 (0)20 7254 7074

The Classical Guitar made by Joseph O'Kelly corrects the notorious tuning inaccuracies of the unwound third string.

This is done by compensation at the Nut as well as at the Bridge.

If the third string on the standard guitar is tuned to "g", "g#" on the same string will be several cents sharper and will not accord with "g#"played on any of the other strings.

The simple and elegant solution is a small protrusion from the nut under the third string. This shortens the distance from the nut to the first fret, thus making "g#" in tune. This design was registered by Joseph O'Kelly in UK Patent GB 2153578 B

(12)UK Patent (19) GB  (11) 2 153 578 B


(54) Title of invention

The compensated classical guitar nut

(51) INTCL4; G10d 3/00


(21) Application No

(22) Date of filing
       27 Jan 1984

(43) Application published         
       21 Aug 1984

(45) Patent published
      4 Feb 1987


(52) Domestic classification
       (Edition I)
       G5J N1BSS

(56) Documents cited
       GB A 2071898
       GB 1199678

(58) Field of search

(73) Proprietor
       Joseph Malachi O'Kelly
       2 Middleton Road
       London E8 4BL

(72)  Inventor
       Joseph Malachi O'Kelly

(74) Agent and/or
      Address for Service
      Joseph Malachi O'Kelly
       2 Middleton Road
       London E8 4BL







The compensated guitar nut improves the intonation of the third string (G of the classical guitar.

It is not uncommon to compensate the G string at the bridge to make accord between the harmonic and the stopped note at the twelfth fret. The lower notes on the string are not brought into tune by this remedy. G sharp will be several cents sharp when stopped at the first fret on the G string. It will not accord with the g Sharp played on the first string at the fourth fret.

The compensated nut shortens the distance from the nut to the first fret on  the third string.

The compensated nut may be made of any of the usual materials, ivory bone wood, metal or synthetic material. It differs from the usual nut in that it has a small protrusion (See fig. 1(a))on to the finger board.