{
  "title": "Mediator",
  "era": "Photographed later three-mast career, circa 1890",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 127,
    "beamFeet": 26,
    "depthOfHoldFeet": 11,
    "beamInferred": false,
    "holdDepthUnknown": false,
    "dimensionsSourceQuality": "Selected documentary baseline; see vessel research notes for length and beam conflicts"
  },
  "geometryReference": {
    "hullBowX": -19.3548,
    "hullSternX": 19.3548,
    "deckY": 3.9,
    "waterlineY": 2.8,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -23.24773830037726,
      0.0050000000000000044,
      -4.0474000000000006
    ],
    "max": [
      19.454800000000002,
      25.903566930366495,
      4.0474000000000006
    ]
  },
  "triangleCount": 46752,
  "trianglesByGroup": {
    "hull": 12950,
    "bulwarks": 9298,
    "fittings": 3044,
    "deck": 6484,
    "steering": 424,
    "anchors": 636,
    "deckhouses": 2152,
    "skylights": 56,
    "spars": 2996,
    "standing_rigging": 3432,
    "running_rigging": 504,
    "furled_canvas": 2600,
    "cargo_hatches": 120,
    "hatch_covers": 240,
    "ship_boat": 1816
  },
  "drawCalls": 46,
  "mastCount": 3,
  "supportsSails": false,
  "visibilityNodes": {
    "hatches": "hatch_covers"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes"
  ],
  "configurationCaveat": "The named stern photograph guides the square stern, aft cabin and later three-mast arrangement. Records also describe an earlier two-mast form. Hidden bow, hatch layout and stowed rigging are inferred. She was launched in 1862 on the bottom of the older schooner Sinbad and rebuilt again around 1883; the 1898 stranding led to abandonment and later sinking.",
  "sources": [
    {
      "title": "Brendon Baillod — Mediator dimensions, rebuild and rig history",
      "url": "https://www.baillod.com/shipwreck/keweenaw/mediator.html"
    },
    {
      "title": "Mining Gazette, January 2020 — survey and circa-1890 stern photograph",
      "url": "https://www.mininggazette.com/news/2020/01/archaeological-survey-of-sunken-ship-provides-clues/"
    },
    {
      "title": "Brendon Baillod — Shipwrecks of the Keweenaw Waterway, conflicting earlier hull identity",
      "url": "https://prezi.com/p/7ggivfwfguwk/shipwrecks-of-the-keweenaw-waterway/"
    }
  ],
  "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": [
    "The account records a 127×26×11 ft vessel launched in July 1862 at Clayton, New York by S.G. Johnson, built on the bottom of the older schooner Sinbad; it records a separate rebuild around 1883. [Brendon Baillod — Mediator dimensions, rebuild and rig history](https://www.baillod.com/shipwreck/keweenaw/mediator.html)",
    "Its rig changed from two to three masts before later towbarge service; the earlier hull identity remains disputed. [Brendon Baillod — Mediator dimensions, rebuild and rig history](https://www.baillod.com/shipwreck/keweenaw/mediator.html)"
  ]
}