I recently had to restring a piano with very long speaking lenghts. With the pscale program I got in the 80% to 85% and that got me really scared. But then I found in "A treatise on the Art of Pianoforte Construction" from Samuel Wolfenden a chart of probable actual breaking strain in pounds. And if I compared my tension, I was way below what Pscale said... Here's a few numbers. Now the author is using europeen gauges so I'll give the diameter in mm. (It's on page 28-29) .800mm 275lbs .825 291 .850 306 .875 321 .900 332 .925 348 .950 366 .975 374 1.000 384 1.025 401 1.050 410 1.075 425 1.125 457 1.175 489 and it goes up like this. Now do these figure make sense to you experts out there or are these in the ball park? So, even if my piano was scary, nothing broke so far, but I can see that this won't be a good thing for the poor bridge that will have to try and survive all this tension. Marcel Carey Sherbrooke, QC _________________________________________________________________ Obtenez Windows 7 pour aussi peu que 39,99 $ – étudiants d’établissements collégiaux et universitaires canadiens seulement. L’offre prend fin le 3 janvier : achetez-le maintenant! http://go.microsoft.com/?linkid=9691829 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20091206/cf17d13c/attachment.htm>
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