That was interesting, UGB! I've had it stuck in my mind that one needs to pop the harmonic at the 12 fret. After reading your article it seems to me that I'd be ending up slightly flat by not fretting it instead. Before I ran into an article about intonation a year or so ago, I had thought I had a lousy instrument because I could never get it in tune. After intonating using harmonics it sounded better, but I still had a hard time tuning. I'm going to try it by freeting instead to see if that makes a difference.
Another thing that gave me fits was that, with my electric tuner, every time I plucked a string, the needle would go sharp a few points, then move to zero, and finally go a tad flat. An earlier post (can't remember who) suggested tuing the string so it finally settled on zero. That seems to work much better for me.
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