Horwell comma

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Interval information
Ratio 65625/65536
Factorization 2-16 × 3 × 55 × 7
Monzo [-16 1 5 1
Size in cents 2.3494767¢
Name horwell comma
Color name Lzy5-2, Lazoquinyo negative 2nd
FJS name [math]\text{dd}{-2}^{5,5,5,5,5,7}[/math]
Special properties reduced
Tenney height (log2 nd) 32.002
Weil height (log2 max(n, d)) 32.0039
Wilson height (sopfr (nd)) 67
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~1.25051 bits
Comma size unnoticeable
open this interval in xen-calc

The horwell comma (monzo: [-16 1 5 1, ratio: 65625/65536) is an unnoticeable 7-limit comma measuring about 2.35 cents. It is the difference between 32/21, the septimal superfifth, and a stack of five 5/4's octave reduced.


Tempering out this comma leads to the horwell temperament, where 32/21 can be found through a stack of five 5/4's and octave reduction. See Horwell family for the rank-3 family where it is tempered out. See Horwell temperaments for a collection of rank-2 temperaments where it is tempered out.


This comma was first named as tertiapont by Gene Ward Smith in 2005 as a contraction of tertiaseptal and pontiac[1]. It is not clear how it later became horwell, but the root of horwell is obvious, being a contraction of hemithirds and orwell.