{
  "title": "Fret divisors 15 to 21 compared with equal temperament",
  "description": "Divisors 15 to 21 and the exact equal-tempered divisor (about 17.82): how many frets each needs before the string is halved, where fret 12 lands on a 648 mm string, how far fret 12 is from the octave in cents (negative means flat), and what Galilei (1581, p. 49) says about each whole-number divisor. Computed for this page.",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "Tricks of Ear and Eye",
  "page": "https://tricksofearandeye.com/instruments/guitar-fret-spacing/",
  "derived_from": [
    "Computed by Tricks of Ear and Eye: frets to halfway = log(1/2) / log((k - 1)/k) for divisor k; verdicts paraphrased from Galilei 1581, p. 49"
  ],
  "method": "Compiled by Tricks of Ear and Eye from the data listed",
  "data_credit": [
    "Verdict on each divisor from Vincenzo Galilei, Dialogo della musica antica, et della moderna (Florence, 1581), p. 49; public domain"
  ]
}