Crawma: Difference between revisions
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''' | '''83521/83486''', known as the '''crawma''', is a [[19-limit]] (more precisely, 2.17/13.19/13 [[subgroup]]) [[unnoticeable comma]]. It forms the difference between a stack of four [[17/13]]'s and a stack of one octave and one [[19/13]]. | ||
== Temperaments == | == Temperaments == | ||
Revision as of 00:58, 13 October 2024
| Interval information |
Nuquadso-atrithu comma
83521/83486, known as the crawma, is a 19-limit (more precisely, 2.17/13.19/13 subgroup) unnoticeable comma. It forms the difference between a stack of four 17/13's and a stack of one octave and one 19/13.
Temperaments
Tempering out this comma in the 19-limit leads to the rank-7 crawmic temperament, or in the 2.17/13.19/13 subgroup, the rank-2 crawic temperament generated by a tempered 17/13. 31edo's 12\31 = 464.516¢ is the first generator to tune crawic accurately, with 17/13, 19/13, and 19/17 respectively having errors +0.088¢, +1.079¢, and +0.991¢. The CTE generator of crawic temperament, 464.236¢, is extremely well-approximated by 53\137 = 464.234¢.
Terminology
The name crawma was proposed by groundfault as a more distinctive-sounding crow-themed name for the comma than "cawma". The word craw has an archaic sense 'to caw, to croak, to crow'.