{
  "annotation_id": "21f0a907-8b46-44fb-931a-6c2575b693c1",
  "date_created": "2026-03-02T18:00:35.310000Z",
  "date_modified": "2026-03-02T18:00:35.310000Z",
  "file_hash": "84295148ed57cc33f9077b80214b903b775857e9bd10283cdb32c586ec903428",
  "private": false,
  "record": {
    "abstract": "We present diagrams and simple calculations for the apparent (i.e.\nphotographable) length of a moving ruler skimming the observer\u0027s position,\nunder three different classes of model. Special relativity\u0027s predictions in\nthis particular situation are the root-product average of the two more basic\nfirst-order predictions generated by simple \"propagation timelag\" arguments. We\nfind that special relativity can legally predict either a photographable\nLorentz contraction or a photographable Lorentz expansion in the \"centred\"\nruler, depending on whether our camera is at the ruler\u0027s \"apparent\" or\n\"official\" centre.",
    "arxiv_id": "physics/0106049",
    "authors": [
      "Eric Baird"
    ],
    "categories": [
      "physics.gen-ph"
    ],
    "title": "The \"optical\" version of the barn-pole problem",
    "url": "https://arxiv.org/abs/physics/0106049"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5e16256e-544c-4745-97f6-4ec5344cdfc4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}