Ron Nossaman wrote: > >This discussion brings another anomoly to mind. When laminated > >soundboards first became common, I expected that, whatever the sonic > >results, at least pitch would be more stable in response to humidity > >swings, because the board would expand/shrink much less. But experience > >hasn't born this out. At least my own experience seems to show no > >difference whatsoever in pitch variation in response to humidity swings > >between solid and laminated boards. > > Anyone care to comment? > >Regards, > >Fred Sturm > > When a bridge swells and pushes the string up the angled pins, the string > must take a longer path between pins, raising tension, therefor pitch. How > much of the pitch change associated with humidity swings is from soundboard > rise and fall, and how much from bridge dimensional changes? > > Ron N No doubt depends on a lot on the variables here... bridges can and are made in a host of ways... for better or worse. And soundboards dont just rise and fall crown wise but swell and contract in the same way as bridges... Isnt there a question on the RPT written exam that basically claims that exactly this swell and contraction is the soundboards most significant change in dimension due to climate ? A good question that deserves a well worked out and researched answer.... would make a great journal article me thinks.. RicB -- Richard Brekne RPT, N.P.T.F. Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html
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