The Jacobins

The Jacobins is a collection of microtemperaments of different ranks which all temper out the jacobin comma, 6656/6655.

The main focus here will be on the 2.5.11.13 subgroup, as the jacobin comma can be entrenched in other temperaments like vidar.

Quite coincidentally, 1789edo supports an enormous amount of these temperaments.

Jacobin-naiadic

Since 6656/6655 is the difference between a stack of three 11/8's and 13/10, it is natural to choose a rank-2 temperament that uses 11/8 as the generator to exploit the comma. Such a mapping is realized through the fractional subgroup 2.13/10.11, which produces a basis with just one comma - namely the 6656/6655. Name given because the 13/10 interval is sometimes referred to as a "naiadic", and this name separates it from the standard diatonic framework.

Subgroup: 2.13/10.11

Comma list: 6656/6655

Sval mapping: 1 2 4, 0 -3 -1

Optimal tuning (CTE): ~16/11 = 648.608

Onzonic

Named for the French word for eleven, onze, since the generator is 11/8. Initially defined for 2.5.11.13, but it can be extended.

Pure onzonic

Pure onzonic is the temperament that was initially referred to as "jacobin" before it was pointed out that the same name would be reserved for the rank-5 temperamnet tempering out 6656/6655 alone (see jacobin-naiadic above).

Subgroup: 2.5.11.13

Comma list: 6656/6655, [-119 -46 15 47⟩

Sval mapping: [⟨1 74 3 74], ⟨0 -156 1 -153]]

Optimal tuning (CTE): ~11/8 = 551.370

Vals: 37, 1789

Estates general

Named so because it is described as the 1789 & 3125 temperament due to 3125 providing the optimal patent val for the jacobin comma, 3125 is 5 to the 5th power, and Estates General were called by Louis XVI on 5th May 1789 (05/05). Defined starting with the 2.5.11.13.19 subgroup, upwards to the 2.5.11.13.19.23.29.31 subgroup.

3 generators below 600 cents lead to 25289/10240, and octave reduced to 247/200 since the jacobin comma is tempered out. 24 generators below 600 cents lead to 88/65.

Subgroup: 2.5.11.13.19

Comma list: 6656/6655, 40960000000/40943078891, [-133 50 -7 18 -6⟩

Sval mapping: [⟨1 118 -107 -212 450], ⟨0 -266 254 496 -1025]]

Optimal tuning (CTE): ~2588443885831192576/1914932769775390625 = 521.856

2.5.11.13.19.23 subgroup

Subgroup: 2.5.11.13.19.23

Comma list: 6656/6655, 62500/62491, 190676992/190653125, [-92 23 -2 14 -10  8⟩

Sval mapping: [⟨1 118 -107 -212 450 579], ⟨0 -266 254 496 -1025 -1321]]

Optimal tuning (CTE): ~2592407900127232/1918105439453125 = 521.856

2.5.11.13.19.23.29 subgroup

Subgroup: 2.5.11.13.19.23.29

Comma list: 6656/6655, 62500/62491, 190676992/190653125, 7592198144/7591796875, 897740062375/897648164864

Sval mapping: [⟨1 118 -107 -212 450 579 251], ⟨0 -266 254 496 -1025 -1321 -566]]

Optimal tuning (CTE): ~184000/136097 = 521.856

2.5.11.13.19.23.29.31 subgroup

31/26 can be reached in 73 generators.

Subgroup: 2.5.11.13.19.23.29.31

Comma list: 6656/6655, 62500/62491, 9425/9424, 190676992/190653125, 507528125/507510784, 519411073024/519363934375

Sval mapping: [⟨1 118 -107 -212 450 579 251 -179], ⟨0 -266 254 496 -1025 -1321 -566 423]]

Optimal tuning (CTE): ~80275/59392 = 521.856

Sextilimeans

Sextilimeans is like sextilififths, but the fourth that is divided into 6 in sextilififths is tuned to a meantone fourth in the optimal tuning, or about 1/4.26-commma meantone. It should be noted, however, that this meantone fourth is not ~4/3 despite that the name may suggest so. In fact, the 3rd harmonic is not mapped in this temperament at all. It is described as the 229 & 1789 temperament.

Subgroup: 2.5.7.11.13

Comma list: 6656/6655, 8122034375/8120172544, [-12 -29 36 -2 -4⟩

Sval mapping: [⟨1 36 23 -24 -45], ⟨0 -482 -289 393 697]]

Optimal tuning (CTE): ~16807/16000 = 83.846

Vals: 229, 1789, ...

Double Bastille

Described as the 1789 & 2814 temperament, and named because 2814 divided in two is 1407, and Bastille storming happened on 14 July 1789. Unfortunately the 1407 & 1789 temperament in the patent val does not temper out the jacobin comma, so it is not included here.

Subgroup: 2.5.7.11.13

Comma list: 6656/6655, [43 -18 0 5 -5⟩, [6 -30 -3 8 12⟩

Sval mapping: [⟨1 26 -938 -51 -136], ⟨0 -30 1192 69 177]]

Optimal tuning (CTE): ~91750400/53094899 = 947.121

Vals: 1789, 2814, ...

French deck

A period-52 temperament described as the 988 & 2444 temperament for the 2.5.11.13.29.31 subgroup, and tempers out the comma 2.29.31 [-5 -52 52⟩, which means 5 periods are equal to 31/29. Called so because there's 52 playing cards in the traditional deck. 1789edo does not support it as 1789 is a prime number, and therefore is not divisible by 52.

Subgroup: 2.5.11.13.29.31

Comma list: 6656/6655, 2177736704/2177265625, 17179869184/17174157715, 57949573168357/57940459520000

Sval mapping: [⟨52 1 197 124 475 480], ⟨0 7 -1 4 -13 13]]

Sval mapping generators: ~1460875/1441792, ~134560000/107132311

Optimal tuning (CTE): ~134560000/107132311 = 394.757

Vals: 988, 1456, 2444, ...

Acrosextilififths

Discovered by Aura and defined as the 159 & 1619 temperament, with prefix acro- denoting the fact that it's a more precise version of sextilififths, with fourth divided into 6 parts in 1619edo just as it is in 159edo.

Subgroup: 2.3.5.7.11.13

Comma list: 6656/6655, 123201/123200, 759375/758912, 2250423/2249728

Mapping: [⟨1 2 21 43 11 45], ⟨0 -6 -270 -581 -109 -597]]

Optimal tuning (CTE): ~1573/1500 = 83.014

Vals: 159, 1460, 1619, 1778, 3079, ...

17-limit

Subgroup: 2.3.5.7.11.13.17

Comma list: 2500/2499, 6656/6655, 61965/61952, 123201/123200, 1285956/1285625

Mapping: [⟨1 2 21 43 11 45 -2], ⟨0 -6 -270 -581 -109 -597 88]]

Optimal tuning (CTE): ~1573/1500 = 83.014

Vals: 159, 1460, 1619, 1778, ..

Declaration of Rights

Defined as the 1789 & 1793 temperament, and called so because that's what both these years have in common.

Subgroup: 2.5.11.13

Comma list: 6656/6655, [-176 23 -2 35⟩

Sval mapping: [⟨1 28 -11 -14], ⟨0 -103 58 71]]

Optimal tuning (CTE): ~2552639375/2147483648 = 299.162

Vals: 353, 357, 361, 710, 718, 1789, 1793, ...

Eternal Revolutionary

Described as the 1789 & 1880 temperament, and is named after a poem by Ivan Franko ^{[UA, no EN]} which was written in the year 1880, hence the name.

Subgroup: 2.5.7.11.13

Comma list: 6656/6655, [-26 5 1 -2 5⟩, [-43 35 35 -17 -21⟩

Sval mapping: [⟨1 261 -472 -159 -225], ⟨0 -535 982 336 473]]

Optima tuning (CTE): ~482745786865234375/344859973188583424 = 580.213 Vals: 1789, 1880