Twenty-Third is listed only by Irwin, who gives the following description:
A rank of open metal Foundation pipes at 8/9' on the manuals, and 1 7/9' on the pedals. It sounds the notes three octaves and one note above the keys struck, at D5 from middle C key, and D1 from the pedal low CCC key. It is roughly in the position of the ninth harmonic of the unison series (on both manuals and pedals). It is a somewhat undiscovered source of brillianct, cymbal-like brassiness on organs. In actual practice it is seen as a small-scale, soft Diapason or Geigen Diapason. It could be a Dulciana as well.
Irwin is incorrect. A properly tuned 8/9' rank will speak at exactly the ninth harmonic, and sound only very roughly a D when played from a C key. Elswhere Irwin gives None as a synonym.
Neuvième is listed only by Sumner, who says: �None. A mutation stop of 8/9-ft. pitch.�
Osiris contains over two dozen examples of None, all at 8/9' pitch except for one at 4/9'; five examples of Neuvième, three at 1 7/9' and two at 8/9'; and a single example of Twenty-Third. With the exception of the Atlantic City organ, we know of no examples prior to the 1950's, and many examples date from the 1960's.
Twenty-Third 8/9', Choir-Swell; Convention Hall, Atlantic City, New Jersey, USA; Midmer-Losh 1929-32. (This stop is unified at octaves to 1 7/9' and 3 5/9'. It is not known whether it is improperly tuned as Irwin describes. Contributions welcome.)
None 4/9', Kronpositivwerk; St. Bonifaz, Munich, Germany; Muhleisen 1977.
None 8/9', Schwellwerk; Wieskirche, Steingaden, Germany; Schmid 1959.
None 8/9', Rueckpositiv; Kreuzkirche, Bonn, Germany; Ott 195?.
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Original site compiled by Edward L. Stauff. For educational use only.|
None.html - Last updated 8 September 2000.