6144/6125
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| Ratio | 6144/6125 |
| Factorization | 211 × 3 × 5-3 × 7-2 |
| Monzo | [11 1 -3 -2⟩ |
| Size in cents | 5.3620463¢ |
| Name | porwell comma |
| Color name | srrg31, sarurutrigu 1sn, Sarurutrigu comma |
| FJS name | [math]\text{d1}_{5,5,5,7,7}[/math] |
| Special properties | reduced |
| Tenney height (log2 nd) | 25.1655 |
| Weil height (log2 max(n, d)) | 25.1699 |
| Wilson height (sopfr (nd)) | 54 |
| Harmonic entropy (Shannon, [math]\sqrt{n\cdot d}[/math]) |
~2.52158 bits |
| Comma size | small |
| open this interval in xen-calc | |
6144/6125, the porwell comma, is a small 7-limit comma measuring about 5.4 cents. It is the amount by which a stack of two 35/32's falls short of 6/5, and the amount by which a stack of two 48/35's exceeds 15/8.
Temperaments
Tempering out this comma alone in the 7-limit leads to the porwell temperament. See Porwell family for the family of rank-3 temperaments where it is tempered out. See Porwell temperaments for a collection of rank-2 temperaments where it is tempered out.
Etymology
This comma was first named as hewuermity by Gene Ward Smith in 2005 as a contraction of hemiwürschmidt and amity[1], and was renamed to porwell in 2010 as a contraction of porcupine and orwell per Petr Pařízek's suggestion[2].