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Here is something new to me. Any comments?...
1) The prong amplitude is not small in comparison
with the maximum [string] amplitudes (at antinodes) and the
first loop on my left side is less than complete;
the length changes with the amplitude of the prong.
2) String oscillations are not confined to the vertical
plane
as in the textbook model.
I can observe loops
from the side and I can observe them from above.
My string is black but it has white spots. White spots
near places where amplitudes are large move along
circles. The antinodes seen from above are about as
wide as when seen from a side. This confirms circular
trajectories.
3) Nodes seen from above are practically at rest
but "nodes" seen from the side are not at rest,
In other words points near the node do not
move along circles.