Viscount Cantorum Trio Mode D'emploi page 102

User Manual
CHAUMONT
A meantone temperament; the wolf fifth has been
improved by enlarging the fifths on Eb and Bb. There are
six pure major thirds: F, C, G, D, A, E. The third major
on B, although not very pleasant, can still be used.
KELLNER 1975
This tuning was created by Kellner, who figured out its
structure from the symbols on the first page of the
"Wohltemperierte Klavier" by Bach, 1722. The tuning is
based on five fifths, each reduced of 1/5 of Pythagorean
comma. This originates three Pythagorean major thirds,
on: C#, F#, G#. None of the thirds is pure. The major
third closer to being pure is on C.
KIRNBERGER III (KIRNBERGER3 on display)
Based on four fifths, each one reduced by ¼ of syntonic
comma, and one fifth reduced of the remaining skisma.
There is only one pure major third on C. From most to
least pure, they are G, D, A and F, Bb, Eb. E, B and F#
are equivalent one with the other. Pythagorean major
thirds are on C# and G#. Pieces with many alterations
are well characterised.
EN - 44