Mercator family: Difference between revisions
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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 | 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 == | == Mercator == | ||
[[Subgroup]]: 2.3.5 | |||
[[Comma list]]: {{monzo| -84 53 }} | [[Comma list]]: {{monzo| -84 53 }} | ||
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{{Multival|legend=1| 0 53 84 }} | {{Multival|legend=1| 0 53 84 }} | ||
[[POTE | [[Optimal tuning]] ([[POTE]]): ~5/4 = 386.264 | ||
{{Val list|legend=1| 53, 477, 530, 583, 636, 689, 742, 795, 848, 901, 1749, 2650 }} | {{Val list|legend=1| 53, 477, 530, 583, 636, 689, 742, 795, 848, 901, 1749, 2650 }} | ||
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== Schismerc == | == 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. | 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. | ||
Subgroup: 2.3.5..7 | |||
[[Comma list]]: 15625/15552, 32805/32768 | [[Comma list]]: 15625/15552, 32805/32768 | ||
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{{Multival|legend=1| 0 0 53 0 84 123 }} | {{Multival|legend=1| 0 0 53 0 84 123 }} | ||
[[POTE | [[Optimal tuning]] ([[POTE]]): ~225/224 = 5.3666 | ||
{{Val list|legend=1| 53, 159, 212, 689c, 901cc }} | {{Val list|legend=1| 53, 159, 212, 689c, 901cc }} | ||
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=== Cartography === | === 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. | 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. | ||
Subgroup: 2.3.5.7.11 | |||
Comma list: 385/384, 6250/6237, 19712/19683 | Comma list: 385/384, 6250/6237, 19712/19683 | ||
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Mapping generators: ~81/80, ~7/1 | Mapping generators: ~81/80, ~7/1 | ||
POTE | Optimal tuning (POTE): ~225/224 = 6.1204 | ||
Optimal GPV sequence: {{Val list| 53, 106d, 159, 212, 371d, 583cde }} | Optimal GPV sequence: {{Val list| 53, 106d, 159, 212, 371d, 583cde }} | ||
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==== 13-limit ==== | ==== 13-limit ==== | ||
13-limit Cartography adds the [[island comma]] to the list of tempered commas | 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: 325/324, 385/384, 625/624, 19712/19683 | |||
Mapping: [{{val| 53 84 123 0 332 196 }}, {{val| 0 0 0 1 -1 0 }} | Mapping: [{{val| 53 84 123 0 332 196 }}, {{val| 0 0 0 1 -1 0 }} | ||
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Mapping generators: ~81/80, ~7/1 | Mapping generators: ~81/80, ~7/1 | ||
POTE | Optimal tuning (POTE): ~225/224 = 6.1430 | ||
Optimal GPV sequence: {{Val list| 53, 106d, 159, 212, 371df, 583cdeff }} | Optimal GPV sequence: {{Val list| 53, 106d, 159, 212, 371df, 583cdeff }} | ||
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=== Pentacontatritonic === | === 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. | 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. | ||
Subgroup: 2.3.5.7.11 | |||
Comma list: 540/539, 15625/15552, 32805/32768 | Comma list: 540/539, 15625/15552, 32805/32768 | ||
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Mapping generators: ~81/80, ~7/1 | Mapping generators: ~81/80, ~7/1 | ||
POTE | Optimal tuning (POTE): ~385/384 = 4.1494 | ||
Optimal GPV sequence: {{Val list| 53, 159e, 212e, 265, 318, 583c }} | Optimal GPV sequence: {{Val list| 53, 159e, 212e, 265, 318, 583c }} | ||
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==== 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. | 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: 540/539, 729/728, 4096/4095, 13750/13689 | Comma list: 540/539, 729/728, 4096/4095, 13750/13689 | ||
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Mapping generators: ~81/80, ~7/1 | Mapping generators: ~81/80, ~7/1 | ||
POTE | Optimal tuning (POTE): ~385/384 = 3.9850 | ||
Optimal GPV sequence: {{Val list| 53, 159ef, 212ef, 265, 318, 583cf }} | Optimal GPV sequence: {{Val list| 53, 159ef, 212ef, 265, 318, 583cf }} | ||
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=== Boiler === | === 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 | 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 | Comma list: 9801/9800, 15625/15552, 32805/32768 | ||
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Mapping generators: ~2835/2816, ~7 | Mapping generators: ~2835/2816, ~7 | ||
POTE | Optimal tuning (POTE): ~225/224 = 6.3976 or ~441/440 = 4.9232 | ||
Optimal GPV sequence: {{Val list| 106, 212 }} | Optimal GPV sequence: {{Val list| 106, 212 }} | ||
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== Joliet == | == Joliet == | ||
Joliet can be characterized as the 53 & 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. | Joliet can be characterized as the 53 & 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 | [[Comma list]]: 225/224, 1728/1715, 3125/3087 | ||
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Mapping generators: ~81/80, ~11/1 | Mapping generators: ~81/80, ~11/1 | ||
[[POTE | [[Optimal tuning]] ([[POTE]]): ~176/175 = 8.8283 | ||
{{Val list|legend=1| 53, 106, 159d }} | {{Val list|legend=1| 53, 106, 159d }} | ||
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=== 13-limit === | === 13-limit === | ||
Subgroup: 2.3.5.7.11.13 | |||
Comma list: 169/168, 225/224, 325/324, 640/637 | Comma list: 169/168, 225/224, 325/324, 640/637 | ||
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Mapping generators: ~81/80, ~11/1 | Mapping generators: ~81/80, ~11/1 | ||
POTE | Optimal tuning (POTE): ~176/175 = 8.1254 | ||
Optimal GPV sequence: {{Val list| 53, 106, 159d }} | Optimal GPV sequence: {{Val list| 53, 106, 159d }} | ||