[pianotech] plastic boards - was soundboard graffiti

[Qshooterq at aol.com]

In about 1970, Rippen pianos was quite bold with their pianos.   In 
addition to reverse threaded tuning pins and reverse crowns, they also made some 
with plastic soundboards.   Maybe someone else remembers better than me.     
--Tom Gorley

In a message dated 9/24/10 9:24:33 PM, dahechler at att.net writes:

> Weirder yet, cover to soundboard with a thin layer of plastic.
> 
> That should keep in the humidity and help keep the soundboard from
> cracking?
> 
> Even more weirder, make the soundboard out of plexiglass - then it will
> never break and yet still be flexible.
> 
> Which that may not sound so weird after all.
> 
> In the old Edison phonographs, what was the vibrating diaphragm made of ?
> 
> Duaine
> 
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