semicomma

Fokker's name for the small interval with the ratio 2109375:2097152 = 2^-21 * 3³ * 5⁷ -- which i prefer to write as [2 3 5]**[-21 3 7] -- = ~10.06099965 cents.

In 5-limit intervals, 100 cents and under, I suggested calling this interval the "super-septapental kleisma".

The tempering-out (vanishing) of this interval defines the family of temperaments which Gene Ward Smith dubbed "orwell".



[from Joe Monzo, JustMusic: A New Harmony]

see also

anomaly
comma
syntonic comma
kleisma
5-limit intervals, 100 cents and under

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