[Harp-L] Re: 64 Chromonica comb design

[Rick Epping <rickepping@xxxxxxxxx>]

Hi Robert,

I don't have a 64 comb at hand, but as I recall, the top chambers have
ramped and raised floors, with dividers running down their middles.  The
function of both elements is to reduce the amount of airspace around the
reeds, thereby raising the resonant frequency.  A reed will sound easiest
and closest to its natural frequency if the resonant frequency of its
surrounding airspace is at or above its own frequency.

The raised floors, being thicker than the rest of the comb, are offset by
about 1mm from the walls dividing the reed chambers to prevent them from
deforming the chamber walls as the comb cools and shrinks after being
removed from its injection molding machine.

Best regards,
Rick


Hi Rick,

looking at the top 3 holes of my 64 chrome, what's the function of the
unusual chamber shape?

Robert Hale