{
  "title": "Knot spacing on a log line, Bowditch (1802) and Smyth (1867)",
  "description": "Every knot spacing on the page: one row per figure, with the glass it goes with, Bowditch’s sea mile where he uses it, whether the figure is printed in the source or worked out from the source’s own numbers, and the page or dictionary entry. Computed rows apply Bowditch’s rule (a knot is the same part of a sea mile as the glass is of an hour) or his “3 or 4 feet” shortening; qualifier quotes the printed wording.",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "From the Surviving Record",
  "page": "https://fromthesurvivingrecord.com/shipwrecks/dead-reckoning/",
  "derived_from": [
    "Nathaniel Bowditch, The New American Practical Navigator (Newburyport, Mass., 1802), pages named in each label or row",
    "W. H. Smyth, The Sailor's Word-Book (London: Blackie and Son, 1867), entries Log-line and log-ship, Log-glass"
  ],
  "method": "Compiled by From the Surviving Record from the data listed",
  "data_credit": [
    "Nathaniel Bowditch, The New American Practical Navigator (Newburyport, 1802), retrieved 2026-11-01, public domain",
    "W. H. Smyth, The Sailor's Word-Book, revised by E. Belcher (London, 1867), retrieved 2026-11-01, public domain"
  ]
}