Opus 66, 2013

Compass: C, D, E - d''', 49 notes

Gedackt pipes of black cherry

Præstant pipes of 85% tin, hand planed

Other metal pipes of 28% tin, hammered

Soundboard of solid yellow poplar, western red cedar, white oak and white pine

Case of solid white oak, fumed in ammonia and stained.

Keyboards of white pine, Turkish boxwood, and Gabon ebony

Single wedge bellows and blower in base of the organ

Wind pressure: 65mm

Pitch: a' = 465

Temperament: Norden meantone

Norden is based on a series of seven fifths narrowed by 1/5 th

Pythagorean Comma. Those modified Meantone temperaments which

are based on intervals using1/5th Syntonic Comma fifths are

more common and can be tuned relatively easily by ear.

However, unlike the intervals Norden, they do not generate thirds

which beat at the same rate as the fifths. During the 1970's a

milder temperament related to Norden was introduced

by Herbert Kellner. It has only five 1/5 Pythagorean Comma

intervals and is held by many to be the most desirable

temperament for the 18th century music of J. S. Bach,

whose music explores all twelve keys.