{
  "name": "Tunnel book structure card",
  "desc": "Structure card for the tunnel book: name, system, structural family, main use, failure modes found by the model, difficulty on this site's 1 to 5 scale, and reference. Each row names its source: Roberts and Etherington (1982), Li, Ju, Gu and Hu (2011), the Johns Hopkins University catalog description of Lane's Telescopic View (1851) as quoted on Wikimedia Commons, or this page's model. Values are written in this site's words; no dictionary text is copied.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Fold, Knot & Bind",
  "url": "https://foldknotbind.com/paper-mechanisms/tunnel-book/",
  "from": [
    "Compiled by Fold, Knot & Bind from Roberts and Etherington (1982), Li, Ju, Gu and Hu (2011) and the Commons file pages for Lane's Telescopic View (1851), read 2026-11-14, and the plan-view model paper-mech 1.1.0; program version tunnel-book-gen 1.0.2; qualifier written per row and program_version column on calculated rows, 2026-11-15"
  ],
  "how": "Compiled by Fold, Knot & Bind from the data listed"
}