string termination

[Carl Meyer]

----- Original Message ----- 
From: "Ric Brekne" <ricbrek@broadpark.no>
To: "pianotech" <pianotech@ptg.org>
Sent: Sunday, August 14, 2005 2:57 AM
Subject: string termination


> Hi Carl.
>
> I doubt seriously you will ever get a clear definitive answer to your 
> question. Dissagreement exists even concerning fundemental string 
> vibrational behaviours, and not just by pianotechs.

You do realize that I am no stranger to disagreementss.


> One thing should be (I say should be) without doubt. Various end 
> conditions of strings most certainly do affect string vibrational 
> behaviour and in turn influence sustain, vibrational directions, energy 
> transfer to the bridge and soundboard, strengths of partials, and others. 
> Its easy enough to hear and measure more then significant change when 
> changes are made.


I don't plan to hear or measure anything.  I only want to look and see what 
is happening to the string.


> Personally, I like what Ed McMorrow had to say on the subject. A short bit 
> in his book and I only mention it because you used the word "pivot" in 
> your note.  It is part of his reasoning as to how the front duplex 
> functions. I have to also agree with his observation that the best capo 
> condition is a 0.5 mm V (not U) on non hardened surface. He has some 
> interesting points also as to how capo grooving can differ for different 
> capo solutions, and how these differences play out in terms of string 
> noises over time.

I have his book and agree with much of what he says.



> Wapin has some hard science to back up his claims worth reading. Been a 
> while since I've heard from them so I am not sure what they have out for 
> public reading any more. Contact him for more info. He has always been 
> more then friendly and helpful in the past.


The "Hard" science i've read in the past was about half hard.  I haven't 
read it lately, but I will look into it.



> You raise an interesting subject to be sure.

Yes, thanks.

Carl Meyer PTG assoc
Santa Clara, Ca.


> Cheers
> RicB
>
> Carl Writes:
>
> Here's my question:  A vibrating string has two terminations.  It is 
> excited in the northern direction.  (Ignore the strike point)  What effect 
> on tone will be the termination of the two ends of the string????? Both 
> north, one north and the other south, east or west????   Or no big 
> difference??
>
>
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