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{{Infobox Interval
{{Infobox Interval
| Icon =
| Name = septimal quartertone, mint comma
| Ratio = 36/35
| Monzo = 2 2 -1 -1
| Cents = 48.77038
| Name = septimal quarter tone
| Color name = rg1, rugu unison
| Color name = rg1, rugu unison
| FJS name = P1<sub>35</sub>
| Sound = ji-36-35-csound-foscil-220hz.mp3
| Sound = ji-36-35-csound-foscil-220hz.mp3
| Comma = yes
}}
}}
{{Wikipedia|Septimal quarter tone}}


The '''septimal quarter tone''' (ratio: 36/35, size: 48.77038 [[cent|cents]]) is the difference between [[10/9]] and [[8/7]], [[7/6]] and [[6/5]], [[5/4]] and [[9/7]], [[14/9]] and [[8/5]], [[5/3]] and [[12/7]], and [[7/4]] and [[9/5]]. It has a numerator which is both the sixth square number and the eighth [https://en.wikipedia.org/wiki/Triangular_number| triangular number,] leading to it being the product of two [[superparticular]] commas both as [[64/63]] × [[81/80]] and as [[66/65]] × [[78/77]]; it is also [[45/44]] × [[176/175]], [[51/50]] × [[120/119]], [[128/125]] × [[225/224]], [[50/49]] × [[126/125]] and [[56/55]] × [[99/98]].
'''36/35''', the '''septimal quartertone''' (~48.8{{cent}}) is the difference between [[10/9]] and [[8/7]], [[7/6]] and [[6/5]], [[5/4]] and [[9/7]], [[14/9]] and [[8/5]], [[5/3]] and [[12/7]], and [[7/4]] and [[9/5]]. It has a numerator which is both the sixth square number and the eighth [[triangular number]], leading to it being the product of two [[superparticular]] commas both as [[64/63]] × [[81/80]] and as [[66/65]] × [[78/77]]; it is also [[45/44]] × [[176/175]], [[51/50]] × [[120/119]], [[128/125]] × [[225/224]], [[50/49]] × [[126/125]] and [[56/55]] × [[99/98]].
 
== Temperaments ==
When treated as a comma to be tempered out, it is known as the '''mint comma''', and tempering it out leads to the [[mint]] temperament. See [[mint family]], the family of rank-3 temperaments where it is tempered out, and [[mint temperaments]], the collection of rank-2 temperaments where it is tempered out.
 
== Etymology ==
The name ''mint comma'' was given by [[Mike Battaglia]] in 2012, for <u>min</u>or <u>t</u>hird because "it mixes 7/6 and 6/5 together into one minty interval"<ref>[https://yahootuninggroupsultimatebackup.github.io/tuning/topicId_103732.html Yahoo! Tuning Group | ''Quartonic'']</ref>. Before that, it had been known as the ''quartonic comma'', which refers to another comma today.
 
== Notation ==
=== Ben Johnston's notation ===
In [[Ben Johnston's notation]], this interval is denoted with "{{invert|7}}" (a turned "7"), and the reciprocal 35/36 with an ordinary "7". If the base note is C, then [[7/4]] is reprented by C–Bb7.
 
=== Sagittal notation ===
In the [[Sagittal]] system, the downward version of this comma (possibly tempered) is represented by the sagittal {{sagittal | \!) }} and is called the '''35 medium diesis''', or '''35M''' for short, because the simplest interval it notates is 35/1 = 5×7 (equiv. 35/16), as for example in C-D{{nbhsp}}{{sagittal | \!) }}. The upward version is called '''1/35M''' or '''35M up''' and is represented by {{sagittal| /|) }}.


== See also ==
== See also ==
* [[35/18]] – its [[octave complement]]
* [[35/18]] – its [[octave complement]]
* [[35/24]] – its [[fifth complement]]
* [[35/24]] – its [[fifth complement]]
* [[Wikipedia: Septimal quarter tone]]
* [[Gallery of just intervals]]
* [[List of superparticular intervals]]
 
== Notes ==


[[Category:7-limit]]
[[Category:Interval ratio]]
[[Category:Quartertone]]
[[Category:Quartertone]]
[[Category:Listen]]
[[Category:Mint]]
 
[[Category:Commas named for the intervals they stack]]
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