[CAUT] 1912 B: speaking lengths anyone?

[Ron Nossaman]

> Due to shifting priorities and budgets, I ended up shoving a 1912 B into 
> the corner for a month or two, after just nicely installing a new board 
> and planing bridges to final height.
> 
>  
> 
> That several month delay somehow turned into several years, and now I 
> find that four winters of single-digit shop humidity has taken a toll. 
> Though there’s still enough crown to work with (sniff), the down-bearing 
> isn’t worth the bother, so rather than whine about it, I’m just going to 
> plane the cap off and start again.

Is it four years, or the likelihood that the current RH% puts 
the board at about the MC at which it was ribbed originally? 
Who built the board, and is it a hybrid rib/compression 
crowned, with machine crowned ribs, or pure compression 
crowned with flat ribs? If the latter, it's likely as fine as 
it ever had a chance of being with that design. Four years of 
no string load shouldn't have dramatically affected the crown, 
even in a purely compression crowned board. At what time of 
year, and at what RH% was the bearing and bridge height 
established? Too many holes in the information so far to 
diagnose.


> So, to preclude any further humbling, it seems like a good time to stop 
> and double-check my speaking lengths. If anyone has a spreadsheet of 
> plain-wire speaking lengths (millimeters, sil vous plais) they wouldn’t 
> mind sharing, I would certainly appreciate it.

I don't understand what the speaking lengths would have to do 
with this, or why they can't be measured in the piano (as they 
should be).
Ron N