A full bar in guitar parlance is not a crowded tavern but a valuable technique that involves placing the left-hand first finger across all the strings. This facilitates the playing of full chords that can be moved as a pattern around the fingerboard.

Learning this new skill is an important step, since it distinguishes the experienced player from the novice. If done correctly, it is an easy and comfortable device; if done wrong, it can cramp the hand and offend the ear.In this chapter we learn to do it the right way.

We’ve seen in our previous study that the first finger of the left hand is sometimes used to cover more than one string, as in the F chord, where it is used for two strings. When the finger goes across all the strings this is known as a full bar. Somewhat illogically, anything less than a full bar is known as a half bar.

Beginners tend to find barring difficult until the left hand has acquired a degree of strength and control. However, if the bar is done correctly it is not necessary to use great strength. As with the half bar, it is far more important to find the right position for the finger so that all the notes can sound clearly with only moderate pressure.

The strings are supported by detachable bones at the nut and bridge (see illustration). The nut bone, which is slightly grooved to provide a guide for each string, sets the height above the fingerboard at that end. If the strings are too low they will buzz against the frets. If they are too high, the guitar becomes hard to play, which can completely discourage you from continuing.

If the setting is too high, the nut bone needs to be removed and filed down from the underside.If it is too low, a sliver of cardboard or similar material may be inserted underneath, but this should be a temporary solution until a new bone of the right height can be obtained. On a classical guitar the height of the strings at the first fret will be about 1/16 in (1.5 mm).

At the bridge end, a similar adjustment can be made to the bridge bone to produce a height at the twelfth fret of approximately 3/16 in (5 mm). The reason the measurements are approximate is that the exact amount depends on the height of the frets and the total string length, both of which vary from maker to maker.

Note that these measurements are for the nylon string guitar. The metal strings of the acoustic guitar are set lower due to the greater tension, and for the sake of the left hand, steel strings need to be as low as is practical, consistent with clear sound.