Undercut bridges

A440A@aol.com A440A@aol.com
Tue, 15 Jul 2003 16:54:57 EDT


   David Love wrote:
<<  What do you think explains the response that (Ed Foote? don't remember 
who it was exactly) got when he placed some wedges between the gaps and board 
and reported an appreciable loss of "tone".  


Del replies: 

>>I don't attempt to explain phenomena such as this unless I am there to 
observe the experiment. There are way too many variables to make flat cause and 
effect statements. How big was the wedge? What was it made out of? Where was it 
placed? How much distortion did it cause? Were all of the glue joints tight? 
What was the condition of the soundboard? Did it have crown? Did it have string 
bearing? What was the overall condition of the bridge? What part of the 
spectrum was affected? What is meant by "loss of tone?" Etc..... >>

Well, this one is easy!  The wedges were pine, 3/4" wide, long enough taper 
to just reach the back side of the cut-out, pushed in firmly by hand in the 
center of each cut-out.  The glue joints all appeared to be tight on the ribs, 
bridges, dowels.  The soundboard was uncracked and had a normal amount of crown 
everywhere except the 5th octave, where it was approx. 1/2 as much as the 
octave below, (again, a somewhat normal set-up).  

   All that aside, it is easy enough to find out for yourself.  simply cut 
some wedges and stuff them under the cutouts in a Steinway bridge.  Listen 
before and after and make up your own mind based on your own observations.  The 
test is easy, reversable, and totally impervious to outside influence!  
Regards,  
Ed Foote RPT 
www.uk-piano.org/edfoote/
www.uk-piano.org/edfoote/well_tempered_piano.html
 <A HREF="http://artists.mp3s.com/artists/399/six_degrees_of_tonality.html">
MP3.com: Six Degrees of Tonality</A>

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