Piano wire tensile strength

[PAULREVENKOJONES@aol.com]

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In a message dated 6/25/2005 7:39:16 PM Central Standard Time, 
Erwinspiano@aol.com writes:

> my experiece with this much twisting always ends up in false beats. I only 
> do this when I have a particularly dead string the won't sing at 1 or 2 twist 
> &stretched for a week or two. Then in desperation &nother twist or so. If it 
> comes up great but later I find them false.

Dale (and Del):

There's no accounting for the widely claimed phenomenon of false beats 
attributed to string twisting; my feeling (short of research) is that this is "post 
hoc ergo propter hoc" reasoning or false cause rather than false beats (real 
beats?). My thinking is that it might have to do with interference in the 
sinusoidal wave form of the string (take a thick rope so you can see it and twist 
it; it will begin to clump at the twist points as it shortens; more tension 
will hide that, but the shortening effect is still there). Another possible cause 
of beating might be that the terminations are now not stable with the twists 
possibly shifting the position of the termination during vibration. I frankly 
don't know. One thing I do know is that it is positively not necessary to 
twist bass strings more than 1 full turn to give them maximum stability (tight 
coils). Any half turn is going to bend the wire back on itself at the bridge pins 
and cause problems down the line. I also think that what Del reported and 
what I have heard about factory work is just that: factory work--a little is 
good, so more is better. 

Paul R-J

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