how do you tell which note the harmonic your plucking is?
Most well-off human beings have two extrusions on the sides of their heads (commonly referred to as ears). We can use them to identify which notes we are playing.
Honestly though. Once you know a little bit of theory and know your way around the fretboard, you'll figure it out.
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"We play basses with more than four strings to make you ask stupid questions. Other than that they're completely useless."- Benjamin Strange
Reading up on Just Intonation and the ratios used for it helped me sort out mentally all the harmonics. A quick guide:
2nd - root (up an octave)
3rd - fifth (up an octave)
4th - root (two octaves, and so on and so forth)
5th - third (a bit flatter than normal)
6th - fifth
7th - minor 7th (quite flat compared to equal-tempered note)
8th - root
9th - major 2nd (a little off)
10th - third (kinda flat again)
11th - sharp 4th (not quite the same as equal-tempered tritone)
12th - fifth
13th - minor sixth (kinda, off)
14th - minor 7th again
15th - major 7th (more or less)
16th - root
