{
  "tool": "Built-in image generation",
  "imageFile": "benjamin-franklin-illustration.png",
  "createdDate": "2026-09-07",
  "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
  "referenceFile": "benjamin-franklin-model-three-quarter.png",
  "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
  "generationPrompt": "Create a highly detailed photorealistic 3D historical visualization of the small Great Lakes Benjamin Franklin side-wheel steamer, 1842–1850. Use the attached newly authored GLB render as the main silhouette and arrangement reference. Long NARROW wooden hull, 135 feet long and 19 feet 10 inches hull beam, with TWO side paddle wheels projecting beyond the beam, one per side at midships, neither a stern wheel nor screw propeller. Wheel diameter approximately five metres, wood spokes and fixed radial floats, pale semicircular upper paddle boxes with gray curved roofs, lower wheel halves visible near the water. A modest single long pale cabin with regularly spaced windows and a simple forward steering house, ONE slender black funnel ahead of the wheels, ONE bare foremast, no sails, small boat stowed on the aft cabin roof, simple skylight and wooden deck. Do not add multiple funnels, ornate Mississippi riverboat decks, extra masts, exposed walking-beam machinery or flags. Refined weathered natural timber and muted cream paint with restrained iron fittings. Entire vessel comfortably within frame, on calm Lake Huron with a distant low forested shore, soft morning light, slight funnel smoke, museum reconstruction look. Three-quarter viewpoint showing side paddle wheel and narrow hull; wide landscape 3:2. No text, labels, borders, people or modern infrastructure. The cabin arrangement and above-water details are interpretive; follow the reference without adding invented grandeur.",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "clean",
    "imageSha256": "1ef0c96bbfa5a22beb2388dd8663749ffe46b5e66b543c003eab31b1eb5c7546",
    "observations": "Four native-pixel crops inspected. No weapons, garbled lettering, material mismatch, added masts, disconnected fittings or modern equipment observed. Interpretive details and background scenery are not documentary evidence."
  },
  "imageSha256": "1ef0c96bbfa5a22beb2388dd8663749ffe46b5e66b543c003eab31b1eb5c7546"
}