{
  "title": "Elma",
  "era": "Original sailing form, c.1873",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 165,
    "beamFeet": 30,
    "depthOfHoldFeet": 11,
    "beamAndDepthInferred": false
  },
  "geometryReference": {
    "hullBowX": -25.146,
    "hullSternX": 25.146,
    "deckY": 3.65,
    "waterlineY": 2.7,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -32.20425449706947,
      0.0050000000000000044,
      -4.657000000000001
    ],
    "max": [
      25.21164868510697,
      31.503294074173652,
      4.657000000000001
    ]
  },
  "triangleCount": 69218,
  "trianglesByGroup": {
    "hull": 12668,
    "bulwarks": 9476,
    "fittings": 3528,
    "deck": 7062,
    "propulsion": 52,
    "anchors": 636,
    "deckhouses": 1080,
    "cargo_hatches": 24,
    "hatch_covers": 336,
    "ship_boat": 1816,
    "spars": 10724,
    "standing_rigging": 3468,
    "sails": 16044,
    "running_rigging": 2304
  },
  "drawCalls": 50,
  "mastCount": 3,
  "supportsSails": true,
  "visibilityNodes": {
    "sails": "sails"
  },
  "deployedSailCount": 5,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes",
    "Absolute spar heights and sail shapes"
  ],
  "configurationCaveat": "Original three-masted schooner; later reported as a two-masted tow barge at loss",
  "sources": [
    {
      "title": "Great Lakes Shipwreck Files, E, ELMA entry",
      "url": "https://greatlakesrex.wordpress.com/e/",
      "use": "Original three-mast schooner versus two-mast barge at loss; 165 x 30 x 11 ft dimensions"
    },
    {
      "title": "St. Clair County history, 1912, Marine City shipbuilding list, 1873",
      "url": "https://ldsgenealogy.com/MI/books/St-Clair-County-Michigan-its-history-and-its-people-a-narrative-account-of-its-historical-progress-and-its-principal-interests-Vol-I-part-48.htm",
      "use": "Historical listing of schooner Elma built 1873, about 400 tons, lost 1895"
    },
    {
      "title": "Munising shipwreck research, Elma entry",
      "url": "https://www.baillod.com/shipwreck/projects/munising/",
      "use": "Corroborates length/beam and three-mast description; hold depth differs"
    }
  ],
  "revisedDate": "2026-09-08",
  "revisionNote": "Added sourced documentary features and repaired metadata and research-note formatting; this collection cleanup is not a new full historical or geometry audit.",
  "documentedFeatures": [
    "Built by D.Lester at Marine City in 1873 as a three-masted schooner. [Great Lakes Shipwreck Files, E, ELMA entry](https://greatlakesrex.wordpress.com/e/)",
    "Compilation dimensions 165×30×11 ft; another compilation gives 10 ft depth. [Great Lakes Shipwreck Files, E, ELMA entry](https://greatlakesrex.wordpress.com/e/)"
  ]
}