{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T21:40:43Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 3,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T10:00:00Z",
      "ingestedAt": "2026-10-06T06:57:27+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:54+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1580122",
    "registryId": "vr.tr.hyperboloid-structure",
    "name": "hyperboloid structure",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1580122/",
  "model": {
    "registry_id": "vr.tr.hyperboloid-structure",
    "name": "hyperboloid structure",
    "purpose": "Let an agent explain the geometry and structural logic of hyperboloid structures, identify notable examples, relay engineering and heritage information, and distinguish them from other lattice and shell structures.",
    "definition": "A structure whose surface follows a hyperboloid of one sheet, a doubly ruled surface that can be built from straight members, giving strength and stiffness with little material; introduced by Vladimir Shukhov in 1896 and used for water towers, radio and transmission towers, cooling towers, lighthouses and buildings such as the Canton Tower.",
    "what_it_is_for": "Efficient towers and shells built from straight members or thin shells.",
    "affordances": [
      "explain the geometry and why straight members work",
      "identify notable examples",
      "relay engineering and heritage information",
      "distinguish from other lattice and shell forms"
    ],
    "distinguishing_features": [
      "Doubly ruled surface",
      "Straight members forming a curved shape",
      "High stiffness with low material",
      "Shukhov origin"
    ],
    "appearance": "A waisted tower or shell, wide at the base and top and narrow in the middle, often a lattice of straight crossing members.",
    "visual_identification": [
      "Waisted surface of a hyperboloid of one sheet",
      "Lattice of straight members or a thin concrete shell",
      "Cylindrical lattice towers and cones are different geometries"
    ],
    "physical_properties": [
      {
        "quantity": "first built",
        "typical_range": "1896",
        "unit": "year",
        "note": "Shukhov water tower, Nizhny Novgorod"
      },
      {
        "quantity": "tallest example",
        "typical_range": "about 600",
        "unit": "m",
        "note": "Canton Tower, Guangzhou"
      }
    ],
    "families_and_kinds": [
      "Shukhov lattice towers",
      "hyperboloid cooling towers in concrete",
      "transmission and radio towers",
      "lighthouses and water towers",
      "hyperboloid buildings and observation towers"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "fixed construction",
        "why": "in registry terms"
      },
      {
        "relation": "is a kind of",
        "target": "lattice structure",
        "why": "when built from members"
      },
      {
        "relation": "has shape",
        "target": "hyperboloid",
        "why": "the surface"
      },
      {
        "relation": "was invented by",
        "target": "Vladimir Shukhov",
        "why": "in 1896"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Structural design codes for towers and shells",
      "Heritage protection of Shukhov towers"
    ],
    "failure_modes_and_hazards": [
      "Corrosion of steel members",
      "Buckling of thin shells",
      "Neglect of heritage structures"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain the geometry of hyperboloid structures and their use in towers and cooling towers.",
        "Report visible damage or corrosion on a hyperboloid structure to its owner."
      ],
      "must_not": [
        "Climb or access a hyperboloid tower without the owner's permission and safety arrangements.",
        "Assess a structure as safe without a qualified engineer's inspection.",
        "Alter or remove members of a lattice tower, since each carries load."
      ],
      "requires_human": [
        "Declaring a heritage hyperboloid tower unsafe or approving its demolition."
      ]
    },
    "ethics": {
      "considerations": [
        "Several early lattice towers are protected heritage of engineering history.",
        "Tall structures endanger people below if neglected."
      ],
      "affected_parties": [
        "People near the structure",
        "Maintenance workers",
        "Heritage communities"
      ]
    },
    "owners": {
      "steward": "The owner of the structure; heritage bodies where it is listed.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1580122: hyperboloid structure",
      "url": "https://www.wikidata.org/wiki/Q1580122",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Hyperboloid structure",
      "url": "https://en.wikipedia.org/wiki/Hyperboloid_structure",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "geometry",
        "name": "Geometry",
        "description": "Shape and structure.",
        "rationale": "Science.",
        "layers": [
          {
            "id": "surface",
            "name": "Surface",
            "description": "The surface.",
            "findings": [
              {
                "id": "surface-finding",
                "name": "Surface",
                "description": "Surface.",
                "questions": [
                  {
                    "text": "What is a hyperboloid of one sheet, and why can straight members form it?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the structure a hyperboloid or another curved form?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "mechanics",
            "name": "Mechanics",
            "description": "Structural behaviour.",
            "findings": [
              {
                "id": "mechanics-finding",
                "name": "Mechanics",
                "description": "Mechanics.",
                "questions": [
                  {
                    "text": "Why are hyperboloid structures stiff and economical?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits structural engineering?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "examples",
        "name": "Examples",
        "description": "Notable structures.",
        "rationale": "Records.",
        "layers": [
          {
            "id": "shukhov",
            "name": "Shukhov",
            "description": "Shukhov towers.",
            "findings": [
              {
                "id": "shukhov-finding",
                "name": "Shukhov",
                "description": "Shukhov.",
                "questions": [
                  {
                    "text": "What towers did Shukhov build, and which survive?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits a specific tower?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "modern",
            "name": "Modern",
            "description": "Modern examples.",
            "findings": [
              {
                "id": "modern-finding",
                "name": "Modern",
                "description": "Modern.",
                "questions": [
                  {
                    "text": "What modern hyperboloid structures exist, from cooling towers to the Canton Tower?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "engineer",
        "name": "Engineer",
        "description": "Design and construction.",
        "rationale": "Practice.",
        "layers": [
          {
            "id": "design",
            "name": "Design",
            "description": "Design.",
            "findings": [
              {
                "id": "design-finding",
                "name": "Design",
                "description": "Design.",
                "questions": [
                  {
                    "text": "How are hyperboloid towers and shells designed and analysed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits shell structures?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "construction",
            "name": "Construction",
            "description": "Construction.",
            "findings": [
              {
                "id": "construction-finding",
                "name": "Construction",
                "description": "Construction.",
                "questions": [
                  {
                    "text": "How are they built, including telescoping erection of Shukhov towers?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits construction methods?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "heritage",
        "name": "Heritage",
        "description": "History and heritage.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did the form spread from Russia to the world?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the history of engineering?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "protection",
            "name": "Protection",
            "description": "Protection.",
            "findings": [
              {
                "id": "protection-finding",
                "name": "Protection",
                "description": "Protection.",
                "questions": [
                  {
                    "text": "Which structures are protected, and what conservation issues arise?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits industrial heritage?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should notable towers be separate entries?",
    "How should engineering references be linked?",
    "How should heritage status be recorded?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}