In reply to the query in MMD 020110 about holes in pipes, another
explanation may be that the pipes had been "stayed" together as a rank
at some time in the past, but not all the screw holes had been plugged.

I've often come across pipe ranks which had been moved either from
another position within the organ, or even from another organ
altogether.  They often have holes which appear to be in odd places
when viewed individually, but make sense when the rank is laid out in
a logical fashion, not necessarily in the order they appear in their
present location.

Incidentally, Paul Morris referred to nodal holes enforcing the "first"
harmonic.  The _first_ harmonic is actually the fundamental note.  When
an open pipe is overblown it sounds its _second_ harmonic.

Regards,
John Page

 [ Physicists use the convenient definition that 1 x fundamental =
 [ '1st harmonic', 2 x fundamental = '2nd harmonic', etc.  The sound
 [ components beyond the fundamental frequency may be called partials
 [ or overtones.  These latter terms are appropriate when speaking
 [ about piano string sounds, since the partials (overtones) deviate
 [ from the harmonic series.  -- Robbie