Crown measurement (was Re: Bridgetop Extravaganza Revisited)

[Phillip Ford]

On Wed, 18 Dec 2002 17:21:40 -0800 David Love <davidlovepianos@earthlink.net>
wrote:

> Get two blocks of wood measuring exactly 7"
> high.  Place 
> them on the soundboard at opposite edges of
> whatever part of the piano you want 
> to measure.  Put a straight edge across
> the top of the two blocks and at a 
> point midway between the blocks, measure the
> distance from the bottom of the 
> straightedge to the soundboard.  Subtract
> that number from 7" and the 
> amount left over is the amount of crown.
>  
> David Love
>  

Or, as Ron N has pointed out before, the difference in thickness of the board
at the measuring point and at the points where the blocks are located.

Phil F