{
  "dataset": "record-ceiling",
  "title": "The measured ceiling of the surviving 78rpm record",
  "required_attribution": "Audio transferred by George Blood, L.P. for the Internet Archive Great 78 Project. The edge measurement, and every column derived from the audio, are by the Artificial Wasteland.",
  "not_a_measurement_of_the_disc_as_pressed": "Every figure here describes a surviving copy in the condition it is in, played on one transfer rig, and served by the archive as an equalised file. It is not the bandwidth the recording chain inscribed.",
  "sources": [
    {
      "id": "src:internet-archive-great78",
      "title": "Great 78 Project item audio and item metadata",
      "publisher": "Internet Archive, with transfers by George Blood, L.P.",
      "url": "https://archive.org/details/georgeblood",
      "accessed": "2026-09-04",
      "licence_id": "UNKNOWN",
      "licence": "Not established. Recorded from the source, not assumed.",
      "licence_basis": "not-established",
      "licence_note": "Read field by field on 2026-09-04: the collection metadata, its parent collection and a representative item carry no licenseurl, no rights field and no public-domain assertion. The Internet Archive asserts no licence and grants no permission, and that silence is recorded here as silence rather than upgraded into permission. No audio is redistributed by this dataset."
    },
    {
      "id": "src:aw-edge-measurement",
      "title": "The edge measurement",
      "publisher": "Artificial Wasteland",
      "url": "https://artwaste.land/strata/the-ceiling-the-record-kept/",
      "accessed": "2026-09-04",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal (public domain dedication)",
      "licence_basis": "publisher-statement",
      "licence_note": "Ours, dedicated to the public domain. The generator is research/the-ceiling-the-record-kept/ and the estimator is edge.py."
    }
  ],
  "rows": 6062
}