Bridge as a 2nd class lever

[Ron Nossaman]

> Dean Reyburn has extensive graphs of the interactions of tension on the 
> bridge, that he used to put the pitch raise feature into RCT.  I assume 
> Robert Scott has similar data.  It may be proprietary to them, of course.
> 
> --Cy--
> 
> ----- Original Message ----- From: "Ric Brekne" <ricbrek at broadpark.no>
> To: "pianotech" <pianotech at ptg.org>
> Sent: Tuesday, August 08, 2006 4:54 PM
> Subject: Bridge as a 2nd class lever
> 
> 
>> I'd like a much closer gander at the printouts and the assumptions 
>> made. As far as I understand there has been no attempt (outside of 
>> mine today) to actually measure in any way whether the model holds 
>> true ??  If someone knows otherwise please send along whatever info 
>> you have.
>>
>> Thanks for any and all comments
>> Cheers
>> RicB


All of which assumes that soundboard deflection is a major 
factor in pitch change, evidence to the contrary. If you can 
make that unsupported presumption work plausibly by either 
demonstration or by math and logic, then you have a potential 
case. Otherwise, you're just making random noise.
Ron N