> >This particular wire woven into the gut makes the string more rigid, 
> >and when vibrating, it is as though the string is shorter, because 
> >it does not quite vibrate for the entire length of the string.

The phrase
   "it does not quite vibrate for the entire length"
is misleading, and could not support a quantitative
analysis.  Here is a more accurate version:

   " ... and when vibrating, it vibrates 
   faster because the rigidity adds extra
   restoring force when the string is displaced 
   from its rest (equilibrium) position."

In other words,

   A limp string gets restoring force
        1. from the tension only.

   A semi-rigid string gets restoring force
        1. from the tension, and
        2. from the rigidity.



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