{
 "source": "Michelson & Morley 1887, Am. J. Sci. 34(203):333-345, tables as transcribed at en.wikisource.org/wiki/On_the_Relative_Motion_of_the_Earth_and_the_Luminiferous_Ether",
 "units": "screw-head divisions; 1 division = 0.02 wavelength (fringe width 40-60, mean ~50)",
 "positions": "17 readings per row: mark 16,1..16 (a full revolution; first and last at same mark)",
 "noon": {
  "July 8": [
   44.7,
   44.0,
   43.5,
   39.7,
   35.2,
   34.7,
   34.3,
   32.5,
   28.2,
   26.2,
   23.8,
   23.2,
   20.3,
   18.7,
   17.5,
   16.8,
   13.7
  ],
  "July 9": [
   57.4,
   57.3,
   58.2,
   59.2,
   58.7,
   60.2,
   60.8,
   62.0,
   61.5,
   63.3,
   65.8,
   67.3,
   69.7,
   70.7,
   73.0,
   70.2,
   72.2
  ],
  "July 11": [
   27.3,
   23.5,
   22.0,
   19.3,
   19.2,
   19.3,
   18.7,
   18.8,
   16.2,
   14.3,
   13.3,
   12.8,
   13.3,
   12.3,
   10.2,
   7.3,
   6.5
  ]
 },
 "evening": {
  "July 8": [
   61.2,
   63.3,
   63.3,
   68.2,
   67.7,
   69.3,
   70.3,
   69.8,
   69.0,
   71.3,
   71.3,
   70.5,
   71.2,
   71.2,
   70.5,
   72.5,
   75.7
  ],
  "July 9": [
   26.0,
   26.0,
   28.2,
   29.2,
   31.5,
   32.0,
   31.3,
   31.7,
   33.0,
   35.8,
   36.5,
   37.3,
   38.8,
   41.0,
   42.7,
   43.7,
   44.0
  ],
  "July 12": [
   66.8,
   66.5,
   66.0,
   64.3,
   62.2,
   61.0,
   61.3,
   59.7,
   58.2,
   55.7,
   53.7,
   54.7,
   55.0,
   58.2,
   58.5,
   57.0,
   56.0
  ]
 },
 "printed_means": {
  "noon": [
   43.1,
   41.6,
   41.2,
   39.4,
   37.7,
   38.1,
   37.9,
   37.8,
   35.3,
   34.6,
   34.3,
   34.4,
   34.4,
   33.9,
   33.6,
   31.4,
   30.8
  ],
  "evening": [
   51.3,
   51.9,
   52.5,
   53.9,
   53.8,
   54.1,
   54.3,
   53.7,
   53.4,
   54.3,
   53.8,
   54.2,
   55.0,
   56.8,
   57.2,
   57.7,
   58.6
  ]
 },
 "verification": {
  "date": "2026-10-24",
  "method": "All 6 day-rows (3 noon, 3 evening, 17 readings each = 102 numbers) read by eye from a 300 dpi render of the AIP scan (history.aip.org/exhibits/gap/PDF/michelson.pdf, p. 340 of the journal) and compared with this transcription.",
  "result": "All 102 match. Not OCR; a human-style visual check by the analyst, so a systematic misreading of one digit shape (e.g. 3 vs 8) would not be excluded, though it would have broken the printed means, which also match."
 }
}