
case, the theory of stationary waves might help:
The fundamental tone has one antinode with a maximum amplitude at the
half length. Then the first octave occurs which has two antinodes, showing
maximums at 1/4 and 3/4. At 1/3 we can see three antinodes which can be
found in the tone as the quintal from the first octave. The second octave
shows at 1/4 length and the third from the second octave at 1/5. The third
octave has six antinodes. The overall tone is given by the superposition of
key tone and all these harmonics.The percentages of the key tone and the
harmonics depend on the guitar characterstics (body, bridge etc.), the
string(s), the notes played and also the way you strike the strings. The quality
of the strings (old or new) also affects the harmonics mix. These pictures also
show the phase shifting along the string length (the dashed lines mean the
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