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{{Technical data page}}
<div class="toccolours" style="float: right">
<center>'''[[Fractional-octave temperaments]]'''</center>
----
<small>← [[{{Ordinal|{{#expr:53-1}}}}-octave temperaments]]</small> 53rd-octave temperaments <small>[[{{Ordinal|{{#expr:53+1}}}}-octave temperaments]] →</small>
</div>
[[Category:53edo]]
[[Category:Fractional-octave temperaments]]
[[Category:Temperament collections]]
[[Category:Pages with mostly numerical content]]
The '''Mercator family''' tempers out [[Mercator's comma]], {{monzo| -84 53 }}, and hence the fifths form a closed 53-note circle of fifths, identical to [[53edo]]. While the tuning of the fifth will be that of 53edo, 0.069 cents flat, the tuning of the larger primes is not so constrained, and the point of these temperaments is to improve on it.  
The '''Mercator family''' tempers out [[Mercator's comma]], {{monzo| -84 53 }}, and hence the fifths form a closed 53-note circle of fifths, identical to [[53edo]]. While the tuning of the fifth will be that of 53edo, 0.069 cents flat, the tuning of the larger primes is not so constrained, and the point of these temperaments is to improve on it.  


= Mercator =
Discussed elsewhere are:
 
* ''[[Aemilic]]'' (+250047/250000) → [[159th-octave temperaments#Aemilic|159th-octave temperaments]]
 
== Mercator ==
[[Subgroup]]: 2.3.5
 
[[Comma list]]: {{monzo| -84 53 }}
 
[[Mapping]]: [{{val| 53 84 123 }}, {{val| 0 0 1 }}]
 
Mapping generators: ~531441/524288, ~5/1
 
[[Optimal tuning]] ([[POTE]]): ~5/4 = 386.264
 
{{Optimal ET sequence|legend=1| 53, 477, 530, 583, 636, 689, 742, 795, 848, 901, 1749, 2650 }}


Comma list: {{monzo| -84 53 }}
[[Badness]]: 0.284323


[[POTE generator]]: ~5/4 = 386.264
== Schismerc ==
As per the name, Schismerc is characterized by the addition of the schisma, [[32805/32768]], to Mercator's comma, which completely reduces all commas in the [[schismic–Mercator equivalence continuum]] to the [[unison]], and thus, the 5-limit part is exactly the same as the 5-limit of 53edo, with the addition of harmonic 7 represented by an independent generator. Among the known 11-limit extensions are cartography, pentacontatritonic and boiler.


Mapping: [{{val| 53 84 123 }}, {{val| 0 0 1 }}]
Subgroup: 2.3.5.7


Mapping generators: ~81/80, ~5/1
[[Comma list]]: 15625/15552, 32805/32768


{{Multival|legend=1| 0 53 84 }}
[[Mapping]]: [{{val| 53 84 123 0 }}, {{val| 0 0 0 1 }}]


{{Val list|legend=1| 53, 477, 530, 583, 636, 689, 742, 795, 848, 901, 1749, 2650 }}
Mapping generators: ~81/80, ~7/1


Badness: 0.2843
[[Optimal tuning]] ([[POTE]]): ~225/224 = 5.3666


= Schismerc =
{{Optimal ET sequence|legend=1| 53, 159, 212, 689c, 901cc }}
As per the name, Schismerc is characterized by the addition of the schisma, [[32805/32768]], to Mercator's comma, which completely reduces all commas in the [[Schismic-Mercator equivalence continuum]] to the [[unison]], and thus, the 5-limit part is exactly the same as the 5-limit of 53edo, with the addition of harmonic 7 represented by an independent generator. Among the known 11-limit extensions are Cartography, and Pentacontatritonic.


Comma list: 15625/15552, 32805/32768
[[Badness]]: 0.087022


POTE generator: ~225/224 = 5.3666
=== Cartography ===
Cartography is a strong extension to Schismerc that nails down both the 7-limit and the 11-limit by adding the [[symbiotic comma]] to Schismerc's list of tempered commas.  The name for this temperament comes from how good the mappings are, and also from the idea of "Mercator" being a dual reference to both Nicolas Mercator and Gerardus Mercator.


Mapping: [{{val| 53 84 123 0 }}, {{val| 0 0 0 1 }}]
Subgroup: 2.3.5.7.11
 
Comma list: 385/384, 6250/6237, 19712/19683
 
Mapping: [{{val| 53 84 123 0 332 }}, {{val| 0 0 0 1 -1 }}]


Mapping generators: ~81/80, ~7/1
Mapping generators: ~81/80, ~7/1


{{Multival|legend=1| 0 0 53 0 84 123 }}
Optimal tuning (POTE): ~225/224 = 6.1204


{{Val list|legend=1| 53, 159, 212, 689c, 901cc }}
{{Optimal ET sequence|legend=1| 53, 106d, 159, 212, 371d, 583cde }}


Badness: 0.0870
Badness: 0.054452


== Joliet ==
==== 13-limit ====
Joliet can be characterized as the 53 & 106 temperament, adding the [[kalisma]] to Schismerc's list of tempered commas.  The name is a reference to 106 being the maximum number of characters in the Joliet- an extension to the ISO 9660 file system.
13-limit Cartography adds the [[island comma]] to the list of tempered commas – a development which fits well with the ideas of mapmaking and geography.  The harmonic 13 in this extension is part of the period and independent of the generator for harmonics 7 and 11.
 
Subgroup: 2.3.5.7.11.13


Comma list:  
Comma list: 325/324, 385/384, 625/624, 19712/19683


POTE generator:  
Mapping: [{{val| 53 84 123 0 332 196 }}, {{val| 0 0 0 1 -1 0 }}


Mapping:  
Mapping generators: ~81/80, ~7/1


Mapping generators:  
Optimal tuning (POTE): ~225/224 = 6.1430


Vals:
{{Optimal ET sequence|legend=1| 53, 106d, 159, 212, 371df, 583cdeff }}


Badness:
Badness: 0.029980


=== 13-limit ===
=== Pentacontatritonic ===
First proposed by [[User:Xenllium|Xenllium]], this temperament nails down both the 7-limit and the 11-limit by tempering out the [[swetisma]].  Like Cartography, Pentacontatritonic is a strong extension to Schismerc.


Comma list:  
Subgroup: 2.3.5.7.11


POTE generator:  
Comma list: 540/539, 15625/15552, 32805/32768


Mapping:  
Mapping: [{{val| 53 84 123 0 481 }}, {{val| 0 0 0 1 -2 }}]


Mapping generators:  
Mapping generators: ~81/80, ~7/1


Vals:
Optimal tuning (POTE): ~385/384 = 4.1494


Badness:
{{Optimal ET sequence|legend=1| 53, 159e, 212e, 265, 318, 583c }}


== Cartography ==
Badness: 0.115066
Cartography nails down the 7-limit by adding the [[symbiotic comma]] to Schismerc's list of tempered commas.  The name comes from how good the mappings are, and also from the fact that it leads to the idea of "Mercator" being a dual reference to both Nicolas Mercator and Gerardus Mercator.


Comma list: 385/384, 6250/6237, 19712/19683
==== 13-limit ====
13-limit Pentacontatritonic adds the schismina to the list of commas being tempered out – in this extension the harmonic 13 is connected to the generator.
 
Subgroup: 2.3.5.7.11.13


POTE generator: ~225/224 = 6.1430
Comma list: 540/539, 729/728, 4096/4095, 13750/13689


Mapping: [{{val| 53 84 123 0 332 }}, {{val| 0 0 0 1 -1 }}]
Mapping: [{{val| 53 84 123 0 481 345 }}, {{val| 0 0 0 1 -2 1 }}


Mapping generators: ~81/80, ~7/1
Mapping generators: ~81/80, ~7/1


{{Val list|legend=1| 53, 106d, 159, 212, 371d, 583cde }}
Optimal tuning (POTE): ~385/384 = 3.9850
 
{{Optimal ET sequence|legend=1| 53, 159ef, 212ef, 265, 318, 583cf }}
 
Badness: 0.061158
 
=== Boiler ===
Boiler nails down both the 7-limit and the 11-limit by adding the [[kalisma]] to Schismerc's list of tempered commas, though unlike with the other extensions of Schismerc, this temperament is not only a weak extension, but lacks a clear 13-limit extension of its own. The name for this temperament is a reference to how 212 degrees Fahrenheit is the boiling point of water, as well as to a number of mechanical devices that boil water for various purposes.
 
Subgroup: 2.3.5.7.11
 
Comma list: 9801/9800, 15625/15552, 32805/32768
 
Mapping: [{{val| 106 168 246 0 69 }}, {{val| 0 0 0 1 1 }}]


Badness: 0.0545
Mapping generators: ~2835/2816, ~7
 
Optimal tuning (POTE): ~225/224 = 6.3976 or ~441/440 = 4.9232
 
{{Optimal ET sequence|legend=1| 106, 212 }}
 
Badness: 0.109648
 
== Joliet ==
Joliet can be characterized as the 53 &amp; 106 temperament, having 7-limit representation akin to 53EDO with the addition of harmonic 11 represented by an independent generator. The name for this temperament is a reference to 106 being the maximum number of characters in the Joliet extension to the ISO 9660 file system.
 
Subgroup: 2.3.5.7.11
 
[[Comma list]]: 225/224, 1728/1715, 3125/3087
 
[[Mapping]]: [{{val| 53 84 123 149 0 }}, {{val| 0 0 0 0 1 }}]
 
Mapping generators: ~81/80, ~11/1
 
[[Optimal tuning]] ([[POTE]]): ~176/175 = 8.8283
 
{{Optimal ET sequence|legend=1| 53, 106, 159d }}
 
[[Badness]]: 0.063254


=== 13-limit ===
=== 13-limit ===
13-limit Cartography adds the [[island comma]] to the list of tempered commas. The harmonic 13 in this extension is part of the period and independent of the generator for harmonics 7 and 11.  
Subgroup: 2.3.5.7.11.13
 
Comma list: 169/168, 225/224, 325/324, 640/637
 
Mapping: [{{val| 53 84 123 149 0 196 }}, {{val| 0 0 0 0 1 0 }}]
 
Mapping generators: ~81/80, ~11/1
 
Optimal tuning (POTE): ~176/175 = 8.1254
 
{{Optimal ET sequence|legend=1| 53, 106, 159d }}
 
Badness: 0.036988
 
== Iodine ==
Proposed by Eliora, the name of ''iodine'' is taken from the convention of naming some fractional-octave temperaments after elements, in this case the 53rd chemical element. It can be expressed as the 159 & 742 temperament. 2 periods + 3 less than 600 cent generators correspond to [[8/5]]. 5 less than 600 cent generators (minus 1 octave) correspond to [[8/7]].  


Commas: 325/324, 385/384, 625/624, 19712/19683
[[Subgroup]]: 2.3.5.7


POTE generator: ~225/224 = 6.1430
[[Comma list]]: {{monzo| -19 14 -5 3 }}, {{monzo| 8 3 -20 12 }}


Mapping: [{{val| 53 84 123 0 332 196 }}, {{val| 0 0 0 1 -1 0 }}
[[Mapping]]: [{{val| 53 84 2 -53 }}, {{val| 0 0 3 5 }}]
 
Mapping generators: ~3125/3087, 6075/3584


Mapping generators: ~81/80, ~7/1
[[Optimal tuning]] ([[CTE]]): ~6075/3584 = 913.7347


{{Val list|legend=1| 53, 106d, 159, 212, 371df, 583cdeff }}
{{Optimal ET sequence|legend=1| 159, 424cd, 583, 742, 2385d, 3127d }}


Badness: 0.0300
[[Badness]]: 0.477


== Pentacontatritonic ==
=== 11-limit ===
First proposed by [[User:Xenllium|Xenllium]], this temperament differs from Cartography in that it tempers out a different 11-limit comma in order to nail down the 7-limit – specifically, the swetisma.
24 periods plus the reduced generator correspond to [[11/8]].


Comma list: 540/539, 15625/15552, 32805/32768
Subgroup: 2.3.5.7.11


POTE generator: ~385/384 = 4.1494
Comma list: 160083/160000, 820125/819896, 4302592/4296875


Mapping: [{{val| 53 84 123 0 481 }}, {{val| 0 0 0 1 -2 }}]
Mapping: [{{val| 53 84 2 -53 143 }}, {{val| 0 0 3 5 1 }}]


Mapping generators: ~81/80, ~7/1
Optimal tuning (CTE): ~6075/3584 = 913.7322


{{Val list|legend=1| 53, 159e, 212e, 265, 318, 583c }}
{{Optimal ET sequence|legend=1| 159, 424cd, 583, 742, 2385d, 3127d }}


Badness: 0.1151
Badness: 0.0875


=== 13-limit ===
=== 13-limit ===
13-limit Pentacontatritonic adds the schismina to the list of commas being tempered out – in this extension the harmonic 13 is connected to the generator.
Subgroup: 2.3.5.7.11.13
 
Comma list: 6656/6655, 34398/34375, 43904/43875, 59535/59488
 
Mapping: [{{val| 53 84 2 -53 143 -46 }}, {{val| 0 0 3 5 1 6 }}]
 
Optimal tuning (CTE): ~441/260 = 913.7115
 
{{Optimal ET sequence|legend=1| 159, 424cdff, 583f, 742, 1643 }}
 
Badness: 0.0476
 
=== 17-limit ===
Subgroup: 2.3.5.7.11.13.17


Comma list: 540/539, 729/728, 4096/4095, 13750/13689
Comma list: 1701/1700, 6656/6655, 8624/8619, 12376/12375, 14875/14872


POTE generator: ~385/384 = 3.9850
Mapping: [{{val| 53 84 2 -53 143 -46 257 }}, {{val| 0 0 3 5 1 6 -1 }}]


Mapping: [{{val| 53 84 123 0 481 345 }}, {{val| 0 0 0 1 -2 1 }}
Optimal tuning (CTE): ~441/260 = 913.7131


Mapping generators: ~81/80, ~7/1
{{Optimal ET sequence|legend=1| 159, 583f, 742 }}


{{Val list|legend=1| 53, 159ef, 212ef, 265, 318, 583cf }}
Badness: 0.0328


Badness: 0.0612
{{Navbox fractional-octave|53}}


[[Category:Theory]]
[[Category:Temperament families]]
[[Category:Temperament family]]
[[Category:Pages with mostly numerical content]]
[[Category:Mercator]]
[[Category:Mercator family]] <!-- main article -->
[[Category:Rank 2]]
[[Category:Rank 2]]
Retrieved from "https://en.xen.wiki/w/Mercator_family"