{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-10-21T21:05:06Z",
    "providers": [
      "Claude"
    ],
    "breadth": "researched by Claude against the sources listed below",
    "pass": 2,
    "wave": 5,
    "engine": "claude",
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-22T10:21:31+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q444789",
    "registryId": "vr.tr.acoustic-mirror",
    "name": "acoustic mirror",
    "version": "0.2.0-wave.5",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q444789/",
  "model": {
    "registry_id": "vr.tr.acoustic-mirror",
    "name": "acoustic mirror",
    "purpose": "Let an agent describe acoustic mirrors historically, explain how they worked, and point to heritage records of surviving examples.",
    "definition": "A large concave reflector, commonly of concrete, built before radar to warn of approaching aircraft by concentrating their sound at a listening point; developed in Britain from the First World War against airships, with examples such as those at Denge. Development was abandoned in the mid-1930s in favour of radar, whose Chain Home network entered operational service from 1938.",
    "what_it_is_for": "Historically, early warning of enemy aircraft; today heritage and education.",
    "affordances": [
      "explain how they worked",
      "describe types and surviving examples",
      "describe their replacement by radar",
      "point to heritage protection"
    ],
    "distinguishing_features": [
      "Passive acoustic detection, before radar; an early 1915 example was cut into chalk.",
      "Limited range, affected by wind and noise; faster aircraft shortened the warning time.",
      "Abandoned in favour of radar in the mid-1930s; Chain Home became operational from 1938."
    ],
    "appearance": "Large concave concrete dishes or curved walls facing out to sea.",
    "visual_identification": [
      "Concave concrete dishes or long curved walls on coastal sites"
    ],
    "physical_properties": [
      {
        "quantity": "bowl diameter",
        "typical_range": "commonly about 3-4 m; Denge about 6.1 and 9.1 m",
        "unit": "",
        "note": "the Denge wall is about 61 m long"
      }
    ],
    "families_and_kinds": [
      "dish mirrors",
      "wall mirrors"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "early warning system",
        "why": "military technology"
      },
      {
        "relation": "was replaced by",
        "target": "radar",
        "why": "technology"
      },
      {
        "relation": "uses",
        "target": "sound focusing",
        "why": "principle"
      },
      {
        "relation": "may be",
        "target": "scheduled monument",
        "why": "heritage"
      }
    ],
    "identifiers": [
      {
        "scheme": "heritage list entry",
        "value_or_pattern": "national heritage list number",
        "note": "for scheduled examples"
      }
    ],
    "standards_and_regulation": [
      "Heritage protection law for scheduled monuments"
    ],
    "failure_modes_and_hazards": [
      "Structural decay",
      "Access risks at coastal sites"
    ],
    "agent_conduct": {
      "may": [
        "describe history and heritage"
      ],
      "must_not": [
        "encourage trespass on protected or unsafe sites"
      ],
      "requires_human": []
    },
    "ethics": {
      "considerations": [
        "heritage conservation"
      ],
      "affected_parties": [
        "visitors",
        "landowners"
      ]
    },
    "owners": {
      "steward": "the landowner or heritage body for each surviving mirror",
      "master_systems": [
        "national heritage lists"
      ]
    },
    "facets_not_applicable": {},
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": []
  },
  "sources": [
    {
      "id": "SRC-001",
      "title": "Q444789",
      "publisher": "Wikidata",
      "url": "https://www.wikidata.org/wiki/Q444789",
      "what_it_supports": "identity of the registry item, labels and sitelinks",
      "url_status": "live"
    },
    {
      "id": "SRC-002",
      "title": "Acoustic mirror",
      "publisher": "Wikipedia",
      "url": "https://en.wikipedia.org/wiki/Acoustic_mirror",
      "what_it_supports": "general description of the subject",
      "url_status": "live"
    },
    {
      "id": "SRC-003",
      "title": "Three acoustic early warning devices 2360m east of Jack's Court",
      "publisher": "Historic England",
      "url": "https://historicengland.org.uk/listing/the-list/list-entry/1005119",
      "what_it_supports": "Denge dimensions, focusing principle, range up to 25 miles, weather limitations, chalk prototype and radar replacement by 1936.",
      "url_status": "blocked"
    },
    {
      "id": "SRC-004",
      "title": "World War I early warning acoustic mirror 60m east of Boulby Barns Farm",
      "publisher": "Historic England",
      "url": "https://historicengland.org.uk/listing/the-list/list-entry/1020760",
      "what_it_supports": "1916 construction, Zeppelin-warning role, smaller mirrors and the effect of increasing aircraft speed.",
      "url_status": "blocked"
    },
    {
      "id": "SRC-005",
      "title": "Acoustic Sound Mirrors at Greatstone-on-Sea, Lydd",
      "publisher": "Kent County Council Historic Environment Record",
      "url": "https://heritage.kent.gov.uk/Monument/MKE3769",
      "what_it_supports": "Denge construction dates, 20 ft and 30 ft dishes, 200 ft wall and condition-dependent detection range.",
      "url_status": "unverified"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "principle",
        "name": "Principle",
        "description": "How it worked.",
        "rationale": "Physics explains design.",
        "layers": [
          {
            "id": "acoustics",
            "name": "Acoustics",
            "description": "Sound focusing.",
            "findings": [
              {
                "id": "principle",
                "name": "Principle",
                "description": "Focusing.",
                "questions": [
                  {
                    "text": "How did the mirror focus sound?",
                    "kind": "definition"
                  },
                  {
                    "text": "What sensor was used?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "performance",
            "name": "Performance",
            "description": "Range and limits.",
            "findings": [
              {
                "id": "performance",
                "name": "Performance",
                "description": "Range and conditions.",
                "questions": [
                  {
                    "text": "What range did it achieve?",
                    "kind": "measurement"
                  },
                  {
                    "text": "What limited it?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "examples",
        "name": "Examples",
        "description": "Surviving mirrors.",
        "rationale": "Sites need records.",
        "layers": [
          {
            "id": "sites",
            "name": "Sites",
            "description": "Locations.",
            "findings": [
              {
                "id": "site",
                "name": "Site",
                "description": "Place and type.",
                "questions": [
                  {
                    "text": "Where are surviving mirrors?",
                    "kind": "provenance"
                  },
                  {
                    "text": "What type are they?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "dimensions",
            "name": "Dimensions",
            "description": "Size.",
            "findings": [
              {
                "id": "dimensions",
                "name": "Dimensions",
                "description": "Values and source.",
                "questions": [
                  {
                    "text": "What are their dimensions?",
                    "kind": "measurement"
                  },
                  {
                    "text": "From which source?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "history",
        "name": "History",
        "description": "Development and end.",
        "rationale": "Radar ended their use.",
        "layers": [
          {
            "id": "development",
            "name": "Development",
            "description": "Designers and dates.",
            "findings": [
              {
                "id": "development",
                "name": "Development",
                "description": "Who and when.",
                "questions": [
                  {
                    "text": "Who developed them and when?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Where were trials held?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "replacement",
            "name": "Replacement",
            "description": "Radar.",
            "findings": [
              {
                "id": "replacement",
                "name": "Replacement",
                "description": "Date and reason.",
                "questions": [
                  {
                    "text": "When were they abandoned?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Why?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "heritage",
        "name": "Heritage",
        "description": "Protection.",
        "rationale": "Many are protected.",
        "layers": [
          {
            "id": "listing",
            "name": "Listing",
            "description": "Status.",
            "findings": [
              {
                "id": "listing",
                "name": "Listing",
                "description": "Status and number.",
                "questions": [
                  {
                    "text": "Is it protected?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Under which listing?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "access",
            "name": "Access",
            "description": "Visits.",
            "findings": [
              {
                "id": "access",
                "name": "Access",
                "description": "Arrangements.",
                "questions": [
                  {
                    "text": "Can the site be visited?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Under what arrangements?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}