The name Twenty-Fifth is listed only by Irwin, who says:
A rank of open metal Foundation pipes that speaks at the unusual pitch of 8/11' on the manuals, and 1 5/11' on the pedals - that is, at three octaves and a fourth above the keys depressed. It sounds from middle C at F4, and from the pedal low CCC key at F1. The 8/11' is between the 4/5' and 2/3' pitches, but, unlike these, it is not an orthodox mixture constituent. It has been heard in a few unusual Cymbals. It very roughly corroborates the eleventh harmonic of the unisons. It lends a very brassy brilliance and unusual timbre to any loud combination.
Irwin is not quite correct; notwithstanding the name Twenty-Fifth, a stop of 8/11' pitch should exactly corroborate the eleventh harmonic of the 8' series, and sound only approximately an F when played from a C key on an equal-tempered instrument. The name Undezime is not mentioned in the literature; we assume it to be a synonym.
See Mutations, Eighteenth.
All known examples are given below.
Twenty-Fifth 8/11', Choir-Swell; Convention Hall, Atlantic City, New Jersey; Midmer-Losh 1929-32.
Undezime 8/11'; Nikolaikirche, Siegen, Germany; Kemper 1955.
Undezime 8/11'; Dreifaltigskirche, Kaufbeuren, Germany; Schmid 1964.
Undecime 8/11'; Dominikanerkirche, Landshut, Germany; Schmid 1966.
Undezime 8/11'; St. Anna, Altötting, Germany; Schmid 1976.
Original site compiled by Edward L. Stauff. For educational use only.|
TwentyFifth.html - Last updated 27 May 2002.