> On May 22, 2017, at 8:38 PM, Norm Purdy <[log in to unmask]> wrote:
> 
> A collegue of mine is rebuilding a double manual instrument (original builder will remain anonymous.)  I've heard that sometimes the nut is tapered from bass to treble, and this is an extreme case.  Can someone explain the theory behind tapering the nut?  It seems to me that this serves no purpose.  Of course, there is very good accoustical reason to taper the bridge, but the nut?  The only effect I can see is to cause problems.  Setting up new jacks must be a nightmare.  The distance from the plectrum to the top of the jack will be different for each note unless the jack rail is tapered to match.  Key dip would be difficult to get consistent, stagger will be hard to get uniform.  All for no particular advantage that I can see.  What am I missing?

Here on planet Hendrik I find it easier to manage calculations (aka guestimations) of down bearing if the strings are kept nominally parallel to the soundboard (think planning the hitchpin rail moulding height, especially in the treble where a high nut would play hob).  I also notice any number of classical instruments that display tapered nuts.  Besides it just seems intellectually tidier to me.  On the other hand, the “extreme” bit of your description is alarming.  This is not a situation where, if one is good, two is better.   Moderation in all things. 

There may be difficulties involved in setting up new (bottom screwless) jacks but they’re easily managed.  I have a five rank installation staring me in the face but I’m not particularly worried.  It’s just time.  I have another 15-y/o (but otherwise identical) instrument back for resale and the original staggering persists.   

Best,

Hendrik Broekman

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