compression waves

[Richard Brekne]

John Delacour wrote:

> At 11:48 PM +0100 11/21/01, Richard Brekne wrote:
> >Might I point out to you two that the fact that the frequencies of the LM are
> >effected by the speaking length in no way necessarilly bears on whether or not
> >those frequencies can run along the whole of the string unneffected by
> >boundries ?
> >
> >This is also born out by the rod experiment that I posted a link to the other
> >day. The frequencies of the LM is determined by where the clamp on the rod is
> >placed, but that in no way affects either the presence or the
> >strength of those
> >frequencies on the other side of that clamp.
>
> I saw the movie and I'd say that rod was at least 10mm thick and the
> clamp not very massive.  I'm not sure these two things are anomalous.
> Between the terminating properties of the fiddle bridge on the one
> hand and the upright agraffe, soundboard bridge etc on the other,
> there is a transitional region.  For example, the double angle of the
> upright agraffe is sufficient to act as a terminal, whereas a single
> 15° bend might not be, or might slightly lower the base frequency.
> Conklin touches on this in his patent -- one of several areas where
> empiricism interferes with the application of his method.

Yes, I can see one is tempted to think along those lines... but then when Conklins
work also point in the same exact direction, along with everything else one bumps
into that seems even slightly related, then it seems likely that these two things
are independent of each other.

>
> >I am also building a monochord to see if I can show exactly this behavior.
>
> We must all get together and give a concert!  If you happen to have a
> stainless steel kitchen sink with a draining board, stand it over
> that and notice the difference.
>
> JD

Sounds like great fun !!



--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no