Page Starrett found showing actual tunings of guitar notes at various frets

[John Starrett:]
> Very interesting.... http://www.izzy.net/~jc/PSTInfo/fretbd.html

John,

You do find the good stuff don't you!!!

I know little about guitars... the higher numbered frets
are the higher pitches where the inharmonicity of the
cylindricalish string and the closer togetherness of the
frets knocks these notes out of tune? Perhaps also the
pressure of the finger on the string has more of a
variability effect on the shorter string lengths?

What about it guitarists? What causes these variances?

- Jeff