{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.cylinder","code":"thing-q34132","url":"https://ver.cy/models/thing/q34132/","name":"cylinder","alternateNames":["rota","gudgeon pin","semicylinder","right circular cylinder","open cylinder","closed cylinder"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A cylindrical surface consisting of all points in three-dimensional Euclidean space at a fixed positive distance from a given straight line called its axis; in this sense it is an unbounded right circular cylindrical surface, not a solid or the broader class of oblique and arbitrary-base cylinders.","purpose":"Let an agent explain the fixed-distance cylindrical surface, describe its geometric properties and bounded portions, and distinguish it from solid cylinders, broader geometric generalisations and mechanical uses of the name.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Axis of symmetry","Circular cross-section","Simple formulas","Many senses"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What a cylinder is.","layers":[{"id":"definition","name":"Definition","description":"Definition and variants.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"How is a cylinder defined, and how do right, oblique, open, closed and generalised cylinders differ?","kind":"definition"},{"text":"Is the geometric solid or a mechanical part meant?","kind":"boundary"}]}]},{"id":"properties","name":"Properties","description":"Properties.","findings":[{"id":"properties-finding","name":"Properties","description":"Properties.","questions":[{"text":"What symmetry, cross-section and developable surface properties does a cylinder have?","kind":"definition"},{"text":"Which entry fits surfaces?","kind":"action"}]}]}]},{"id":"compute","name":"Compute","description":"Calculations.","layers":[{"id":"volume","name":"Volume","description":"Volume and area.","findings":[{"id":"volume-finding","name":"Volume","description":"Volume.","questions":[{"text":"What are the volume and surface area of this cylinder or semicylinder?","kind":"action"},{"text":"Which entry fits volume?","kind":"action"}]}]},{"id":"coordinates","name":"Coordinates","description":"Equations and coordinates.","findings":[{"id":"coordinates-finding","name":"Coordinates","description":"Coordinates.","questions":[{"text":"How are cylinders described by equations and cylindrical coordinates?","kind":"definition"},{"text":"Which entry fits coordinate systems?","kind":"action"}]}]}]},{"id":"apply","name":"Apply","description":"Applications.","layers":[{"id":"engineering","name":"Engineering","description":"Cylindrical objects.","findings":[{"id":"engineering-finding","name":"Engineering","description":"Engineering.","questions":[{"text":"How do cylindrical shapes appear in pipes, tanks, rollers and structures, and how are they engineered?","kind":"provenance"},{"text":"Which entry fits pressure vessels?","kind":"action"}]}]},{"id":"mechanical","name":"Mechanical","description":"Mechanical senses.","findings":[{"id":"mechanical-finding","name":"Mechanical","description":"Mechanical.","questions":[{"text":"What are engine cylinders, hydraulic cylinders and related parts?","kind":"definition"},{"text":"Which entry fits engine cylinders?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How did Archimedes and later mathematicians study the cylinder?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can cylinders be taught with nets and models?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain the fixed-distance definition and the properties of the resulting cylindrical surface.","Discuss the area of a bounded portion when its boundaries are specified.","Distinguish this surface from solid cylinders and geometric generalisations."],"mustNot":["Confuse the geometric cylindrical surface with engine or gas cylinders.","Treat oblique or arbitrary-base cylinders as satisfying this fixed-distance definition in general.","Assign a finite total surface area or enclosed capacity to the unbounded surface.","Present computed capacities for tanks without stating assumptions."],"requiresHuman":["Using calculated capacities for pressure vessels or storage decisions requires human review."]},"ethics":{"considerations":["Calculation errors propagate into wrong capacities and costs.","Clear teaching supports learners."],"affectedParties":["Students","Engineers","People relying on calculations"]},"owners":{"steward":"Nobody: a mathematical concept held in common.","roles":[],"masterSystems":[]},"relations":[{"target":"Q1541599","type":"parent","note":"registry parent class"},{"target":"Q3008657","type":"parent","note":"registry parent class"},{"target":"Q4751134","type":"parent","note":"registry parent class"},{"target":"geometric primitive","type":"related","note":"category"},{"target":"analytic manifold","type":"related","note":"category"},{"target":"base","type":"related","note":"the bases of a cylinder"},{"target":"plane","type":"related","note":"cross-sections of cylinders"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.cylinder","Wikidata: Q34132 (https://www.wikidata.org/wiki/Q34132)"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Every point on the surface is at the same fixed distance from its straight axis.","Cross-sections perpendicular to the axis are circles.","The surface extends indefinitely along its axis and has no end caps or filled interior.","A cone tapers, a prism has polygonal bases, and an engine cylinder is a machine part.","A tube or can shape with circular ends."]},"capabilities":{"applicability":"required","items":["explain the geometric cylinder","support calculations","describe variants","separate other senses"]},"hazards":{"applicability":"required","items":["Confusing senses of cylinder","Formula errors for oblique or open cylinders","Confusing surface and solid"]},"interfaces":{"applicability":"required","items":["Mathematical conventions","Engineering standards for cylindrical parts","No regulation of the concept"]},"context":{"applicability":"required","items":["Solid or surface of points at fixed distance from an axis.","right circular cylinders","oblique cylinders","semicylinders and cylindrical segments","open and closed cylindrical surfaces","generalised cylinders over other curves"]}},"sources":[{"title":"Wikidata item Q34132: cylinder","url":"https://www.wikidata.org/wiki/Q34132","note":"identity and sense of the item"},{"title":"Wikipedia: Cylinder","url":"https://en.wikipedia.org/wiki/Cylinder","note":"general description of the item"}],"openQuestions":["Should mechanical cylinders be a separate entry?","How should geometry resources be linked?","How should engineering standards be linked?"],"resources":{"spec":"/models/things/publications/thing-q34132/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q34132/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T03:55:22Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:30+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}