{ "model": { "rank": 3026, "code": "thing-q81982", "model_id": "vr.tr.harpsichord", "name": "harpsichord", "purpose": "Enable an AI agent to recognise a harpsichord, assess its musical and material readiness, and determine which playing, adjustment, maintenance or conservation actions are appropriate.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.OBJ", "industry": "", "version": "", "url": "/models/thing/q81982/", "tier": 2, "score": 92, "payload": { "layer": "wikidata", "aliases": [ "Musikhaus Kurt Sperrhake", "pedal harpsichord", "Spinettone", "clavicytherium", "ottavino", "spinet", "octave spinet", "oval spinet" ], "aliasCount": 8, "merged": 8, "knownIn": 92, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.harpsichord", "source": { "dataset": "wikidata", "item": "Q81982", "url": "https://www.wikidata.org/wiki/Q81982", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T14:18:34Z", "providers": [ "Codex", "Grok" ], "missingProviders": [], "pass": 2, "cost": { "grok": { "usd": 0.0132362, "turns": 1, "seconds": 162.7, "error": null }, "codex": { "seconds": 87.2, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c38-ce4a-7263-89af-31abe5feaba3\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: harpsichord\nRegistry id: vr.tr.harpsichord\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\nA" } } }, "metaModel": { "id": "THING-Q81982", "registryId": "vr.tr.harpsichord", "name": "harpsichord", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.OBJ" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q81982/", "model": { "registry_id": "vr.tr.harpsichord", "name": "harpsichord", "purpose": "Enable an AI agent to recognise a harpsichord, assess its musical and material readiness, and determine which playing, adjustment, maintenance or conservation actions are appropriate.", "definition": "A harpsichord is a wing-shaped keyboard chordophone whose action lifts a jack so that a plectrum (historically quill or leather) plucks a taut string or choir and a damper silences it on key release, producing a plucked timbre whose loudness is essentially independent of key velocity.", "scope_statement": "This model owns the identity, construction, playing configuration, acoustic behaviour, condition and intervention constraints of an individual harpsichord registered as vr.tr.harpsichord within PHY / PHY.OBJ, while leaving unresolved the registry boundary with related plucked keyboard instruments.", "in_scope": [ "Keyboard-operated plucking mechanism, including keys, jacks, plectra, tongues and dampers", "Manuals, string choirs, registers, couplers and playable compass", "Strings, bridges, soundboard, case and their functional relationships", "Tuning configuration, note response and musical readiness", "Alterations, component originality and constraints on playing or intervention" ], "out_of_scope": [ "Performer technique, competence and physical condition", "Musical compositions, editions and performance interpretations", "Room acoustics and building climate systems", "Workshop tools and inventories of uninstalled replacement parts", "Ownership transactions, insurance contracts and institutional collection policy" ], "distinguishing_features": [ "Observe whether a key raises a jack whose plectrum plucks a string; a hammer striking the string instead indicates a different keyboard mechanism.", "Check whether a tangent strikes and remains against the string while the key is held, which distinguishes a clavichord mechanism from a harpsichord action.", "Confirm that keys operate the plucking mechanism directly through the action rather than selecting electronically generated or sampled sounds.", "Record case form, string orientation and string arrangement before distinguishing a harpsichord from a spinet or virginal; those names alone do not settle this registry entry's boundary." ], "characteristics": [ { "name": "Sound-production mechanism", "kind": "category", "unit_or_values": "Jack-and-plectrum string plucking; other; unresolved", "why_it_matters": "Provides the central recognition test and identifies instruments requiring another model." }, { "name": "Keyboard compass", "kind": "category", "unit_or_values": "Lowest and highest sounding notes, key count and exceptional key-to-note mappings, recorded per manual", "why_it_matters": "Determines playable material and prevents assumptions about short octaves or split keys." }, { "name": "Manual and register disposition", "kind": "relation", "unit_or_values": "Mapping of manuals, jack rows, string choirs, stops and couplers, including nominal pitch designation where established", "why_it_matters": "Explains which strings each key can activate under each available configuration." }, { "name": "Action response", "kind": "state", "unit_or_values": "Per key and register: plucks, misses, repeats reliably, sticks, double-plucks or remains untested", "why_it_matters": "Locates faults that affect playability and helps distinguish action problems from tuning problems." }, { "name": "Plectrum material", "kind": "category", "unit_or_values": "Identified material, mixed materials or unknown, recorded by jack or jack row", "why_it_matters": "Informs voicing assessment and compatibility of repairs." }, { "name": "Reference pitch", "kind": "measurement", "unit_or_values": "Hz at a named reference note, with measurement date and conditions", "why_it_matters": "Supports ensemble compatibility and assessment of a proposed tuning change." }, { "name": "Temperament", "kind": "category", "unit_or_values": "Documented temperament or measured interval pattern; unknown", "why_it_matters": "Separates intentional tuning relationships from unintended tuning drift." }, { "name": "String specification", "kind": "measurement", "unit_or_values": "Speaking length and diameter in mm, linked to note, choir and identified material", "why_it_matters": "Supports informed string replacement and evaluation of tension-related concerns." }, { "name": "Structural condition under tension", "kind": "state", "unit_or_values": "Located observations of cracks, deformation, loose joints and bridge or pin movement; stability established, unresolved or unassessed", "why_it_matters": "Constrains tuning, playing, handling and repair." }, { "name": "Component history", "kind": "relation", "unit_or_values": "Components linked to evidence of manufacture, replacement, alteration or restoration", "why_it_matters": "Prevents a modern replacement or alteration from being mistaken for original construction." } ], "affordances": [ "Identify the instrument through its keyboard, plucking action and string arrangement.", "Determine playable compass and available registrations for a proposed musical use.", "Conduct an authorised note-by-note response and damping assessment when condition permits.", "Measure tuning and compare the current configuration with a documented target.", "Locate action, stringing or structural problems and route them to an appropriately qualified specialist.", "Determine whether playing, tuning, voicing, restringing or moving can proceed under documented constraints." ] }, "sources": [ { "id": "kottick-2003", "title": "A History of the Harpsichord - Edward L. Kottick, Indiana University Press (2003)", "url": "", "what_it_supports": "National schools, compass and disposition practice, clavicytherium and pedal instruments, and the 20th-century revival versus historically informed copies." }, { "id": "hubbard-1965", "title": "Three Centuries of Harpsichord Making - Frank Hubbard, Harvard University Press (1965)", "url": "", "what_it_supports": "Construction, scaling, jack action, and the Italian, Flemish, French, English and German making traditions." }, { "id": "grove-harpsichord", "title": "Harpsichord - The New Grove Dictionary of Music and Musicians / Grove Music Online, Oxford University Press", "url": "", "what_it_supports": "Organological definition, family relationship to virginal and spinet, historical pitch and use in continuo and solo repertory." }, { "id": "hornbostel-sachs-1914", "title": "Systematik der Musikinstrumente - Erich M. von Hornbostel and Curt Sachs, Zeitschrift für Ethnologie (1914), as used in later MIMO revisions", "url": "", "what_it_supports": "Taxonomic identifier 314.122-6-8 for keyboard board zithers sounded by plectrum." } ], "structure": { "bundles": [ { "id": "instrument-identity-and-history", "name": "Instrument identity and history", "description": "Establishes why this instrument belongs to the harpsichord entry and which construction history its present form represents.", "rationale": "Recognition depends on mechanism and construction, while attribution and later alterations affect interpretation and permissible intervention.", "layers": [ { "id": "mechanism-and-family-boundary", "name": "Mechanism and family boundary", "description": "Tests the sound-producing mechanism and records features needed to resolve neighbouring instrument classifications.", "findings": [ { "id": "observed-plucked-keyboard-identity", "name": "Observed plucked keyboard identity", "description": "Records observed evidence for classification without treating appearance or a supplied name as conclusive.", "questions": [ { "text": "Does pressing a key raise a jack whose plectrum plucks a string, and which parts of that sequence were directly observed?", "kind": "definition", "id": "observed-plucked-keyboard-identity-q01" }, { "text": "Do the case form and string arrangement place this instrument within this registry entry or require a boundary decision concerning a spinet or virginal?", "kind": "boundary", "id": "observed-plucked-keyboard-identity-q02" } ] } ] }, { "id": "construction-and-alteration-history", "name": "Construction and alteration history", "description": "Separates supported maker or model attribution from later changes to the instrument.", "findings": [ { "id": "supported-attribution-and-component-history", "name": "Supported attribution and component history", "description": "Connects identity claims and consequential alterations to inspectable evidence.", "questions": [ { "text": "Which inscriptions, records or examinations support the maker, date and any claimed historical prototype?", "kind": "provenance", "id": "supported-attribution-and-component-history-q01" }, { "text": "Which changes to the compass, manuals, stringing or action are documented, and which remain suspected?", "kind": "provenance", "id": "supported-attribution-and-component-history-q02" } ] } ] } ] }, { "id": "keyboard-and-registration", "name": "Keyboard and registration", "description": "Describes how the player selects notes and combinations of sounding strings.", "rationale": "Key count alone does not establish sounding compass, and visible controls do not establish their current musical function.", "layers": [ { "id": "manuals-and-note-mapping", "name": "Manuals and note mapping", "description": "Maps each keyboard to its actual sounding notes and identifies exceptional layouts.", "findings": [ { "id": "verified-playing-compass", "name": "Verified playing compass", "description": "Records the usable note range and departures from an assumed consecutive chromatic layout.", "questions": [ { "text": "What are the key count and lowest and highest sounding notes of each manual?", "kind": "measurement", "id": "verified-playing-compass-q01" }, { "text": "Are short-octave arrangements, split keys or transposition facilities present, and how do they change the key-to-note mapping?", "kind": "definition", "id": "verified-playing-compass-q02" } ] } ] }, { "id": "choirs-stops-and-coupling", "name": "Choirs, stops and coupling", "description": "Relates register controls to jack rows, string choirs and connections between manuals.", "findings": [ { "id": "available-registration-paths", "name": "Available registration paths", "description": "Distinguishes the intended disposition from combinations that currently function.", "questions": [ { "text": "Which string choirs does each manual activate through each jack row, and what pitch relationship does each choir have to the played key?", "kind": "definition", "id": "available-registration-paths-q01" }, { "text": "Which stops, couplers and buff effects, if present, operate correctly, and what procedure or restriction governs changing them?", "kind": "action", "id": "available-registration-paths-q02" } ] } ] } ] }, { "id": "plucking-action-and-voicing", "name": "Plucking action and voicing", "description": "Assesses the mechanical sequence that produces, repeats and stops each note.", "rationale": "A harpsichord can be in tune while missing notes, failing to repeat or sustaining after release; these require distinct observations.", "layers": [ { "id": "key-jack-and-plectrum-response", "name": "Key, jack and plectrum response", "description": "Examines the movement and plucking behaviour of the action by key and register.", "findings": [ { "id": "reliable-pluck-and-return", "name": "Reliable pluck and return", "description": "Locates irregularities in key travel, jack movement, plectrum engagement and tongue return.", "questions": [ { "text": "For each tested register, which keys miss, stick, double-pluck or fail to repeat, and under what playing conditions?", "kind": "measurement", "id": "reliable-pluck-and-return-q01" }, { "text": "What plectrum materials and visible conditions are present, and which observations justify specialist regulation or voicing?", "kind": "action", "id": "reliable-pluck-and-return-q02" } ] } ] }, { "id": "damping-and-note-consistency", "name": "Damping and note consistency", "description": "Evaluates note release and uneven response without assuming every tonal difference is a defect.", "findings": [ { "id": "controlled-release-and-voicing-assessment", "name": "Controlled release and voicing assessment", "description": "Records ineffective damping and tonal or touch differences against an explicit assessment target.", "questions": [ { "text": "Which strings continue sounding after key release when they should be damped, and is the behaviour tied to a particular registration?", "kind": "measurement", "id": "controlled-release-and-voicing-assessment-q01" }, { "text": "Which differences in attack, loudness or touch are judged unintended, and what documented voicing aim supports that judgment?", "kind": "boundary", "id": "controlled-release-and-voicing-assessment-q02" } ] } ] } ] }, { "id": "stringing-tuning-and-resonance", "name": "Stringing, tuning and resonance", "description": "Connects string specifications and tuning choices to the instrument's observed acoustic performance.", "rationale": "A desired pitch or replacement string must be evaluated against the particular instrument rather than assumed from keyboard layout.", "layers": [ { "id": "string-scaling-and-replacement", "name": "String scaling and replacement", "description": "Records installed string specifications and the evidence needed for compatible replacement.", "findings": [ { "id": "documented-stringing-basis", "name": "Documented stringing basis", "description": "Links notes and choirs to string dimensions, materials, condition and replacement evidence.", "questions": [ { "text": "What speaking lengths, diameters and identified materials are recorded for each choir and relevant note range?", "kind": "measurement", "id": "documented-stringing-basis-q01" }, { "text": "What maker documentation, stringing schedule or specialist assessment supports replacing a missing or damaged string?", "kind": "provenance", "id": "documented-stringing-basis-q02" } ] } ] }, { "id": "pitch-temperament-and-acoustic-response", "name": "Pitch, temperament and acoustic response", "description": "Separates tuning configuration from drift and from faults in resonance or string termination.", "findings": [ { "id": "established-tuning-and-sounding-condition", "name": "Established tuning and sounding condition", "description": "Records the current tuning basis and note-specific acoustic anomalies.", "questions": [ { "text": "What reference pitch and temperament are established, and how far do measured notes depart from that target under recorded conditions?", "kind": "measurement", "id": "established-tuning-and-sounding-condition-q01" }, { "text": "Which notes exhibit buzzing, unusually short sustain or unstable pitch, and what observations help locate the cause?", "kind": "measurement", "id": "established-tuning-and-sounding-condition-q02" }, { "text": "What instrument-specific evidence permits the proposed pitch change or tuning operation?", "kind": "action", "id": "established-tuning-and-sounding-condition-q03" } ] } ] } ] }, { "id": "structural-condition-and-use-constraints", "name": "Structural condition and use constraints", "description": "Determines how material condition and conservation commitments constrain use of the strung instrument.", "rationale": "Musical functionality alone cannot establish that an instrument should be tuned, played, moved or altered.", "layers": [ { "id": "tension-bearing-and-resonant-structure", "name": "Tension-bearing and resonant structure", "description": "Assesses the case, pin-bearing areas, bridges and soundboard in relation to string tension and sounding function.", "findings": [ { "id": "located-damage-and-stability-evidence", "name": "Located damage and stability evidence", "description": "Distinguishes visible damage from demonstrated movement or loss of structural function.", "questions": [ { "text": "Where are cracks, deformation, loose joints or bridge and pin movement recorded, and what dated observations establish whether they are changing?", "kind": "measurement", "id": "located-damage-and-stability-evidence-q01" }, { "text": "Which findings require specialist assessment before tuning or playing, and what evidence would resolve the restriction?", "kind": "action", "id": "located-damage-and-stability-evidence-q02" } ] } ] }, { "id": "playing-care-and-conservation-decisions", "name": "Playing, care and conservation decisions", "description": "Connects intended use with handling instructions, environmental evidence and limits on intervention.", "findings": [ { "id": "supported-use-and-intervention-envelope", "name": "Supported use and intervention envelope", "description": "Records which operations are appropriate for this instrument and the evidence and authority supporting them.", "questions": [ { "text": "What maker or conservator guidance governs acclimatisation, support, lifting and transport, and do current conditions satisfy it?", "kind": "action", "id": "supported-use-and-intervention-envelope-q01" }, { "text": "Which tuning, voicing, string replacement or structural interventions are permitted, by whom, and with what requirements to retain or document historic material?", "kind": "action", "id": "supported-use-and-intervention-envelope-q02" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-kinds", "name": "Kinds and varieties", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Italian single-manual harpsichord (light cypress case, typically 8' or 8'+8', short scaling)", "Flemish harpsichord of the Ruckers school (often 8'+4', decorated soundboard, transposing double in some examples)", "French double-manual harpsichord (8'+8'+4', shove coupler, often a peau de buffle register; many are ravalements of Flemish instruments)", "German/Hamburg harpsichord (frequently a 16' choir; rare three-manual Hass instruments)", "English harpsichord (Shudi/Kirckman tradition: machine stop, lute stop, sometimes Venetian swell)", "Clavicytherium (upright harpsichord with a vertical soundboard)", "Pedal harpsichord (independent pedalboard instrument or pull-down pedals, used especially for organ practice and Bach)", "Twentieth-century revival harpsichord (Pleyel, Neupert and similar: heavier frames, pedals for stops, not copies of historical actions)" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "scheme": "Wikidata", "value_or_pattern": "Q81982", "note": "Item for the harpsichord as a type of musical instrument." }, { "scheme": "Hornbostel-Sachs (MIMO revision)", "value_or_pattern": "314.122-6-8", "note": "True board zither with resonator box, sounded by plectrum, with keyboard; shared with virginals and spinets." }, { "scheme": "Getty AAT", "value_or_pattern": "300042047", "note": "Preferred term: harpsichords (chordophones)." }, { "scheme": "General MIDI program", "value_or_pattern": "7 (1-based); program change 6 (0-based)", "note": "GM patch name Harpsichord; a playback mapping, not a physical-instrument identifier." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "ISO 16:1975 (International Organization for Standardization) - standard concert pitch A4 = 440 Hz; historically informed harpsichords more often stand at A4 ≈ 415 Hz, 392 Hz or 466 Hz and are not bound to ISO 16 in performance.", "CITES (CITES Secretariat, implemented by national law) - elephant-ivory key coverings and some tortoiseshell or exotic-wood parts on historic and reproduction instruments.", "EU Timber Regulation / EU Deforestation Regulation (European Union) and the Lacey Act (United States) - trade in protected hardwoods used for cases, bridges and soundboards (e.g. Brazilian rosewood).", "ICOM Code of Ethics for Museums (International Council of Museums) - governs conservation, loan and treatment of historic instruments in public collections rather than the instrument type as a manufactured product." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Basso continuo in Baroque opera, oratorio, church and chamber ensembles (often sharing the chordal role with organ or theorbo).", "Solo and accompanied keyboard repertory from the 16th-18th centuries (Byrd, Frescobaldi, Froberger, Couperin, Rameau, Scarlatti, J. S. Bach, Duphly) in concert, recording and conservatory teaching.", "Historically informed performance on copies of specific national schools, typically at A4 ≈ 415 Hz in meantone, well or circulating temperaments.", "Organists' practice instrument when a pedal harpsichord is available.", "Museum display and playing collections; amateur early-music societies; occasional new works that specify harpsichord rather than piano." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "quantity": "Keyboard compass", "typical_range": "Historical about C/E-c''' (short octave) up to five octaves FF-f'''; modern copies commonly FF-f''' or GG-g'''", "unit": "named pitches / octaves" }, { "quantity": "c'' (c2) string scaling", "typical_range": "Italian about 25-28; Flemish and French about 33-36", "unit": "cm" }, { "quantity": "Case length (wing, excluding lid overhang)", "typical_range": "about 1.8-2.4 Italian; French and English about 2.2-2.5; German 16' instruments up to about 2.7", "unit": "m" }, { "quantity": "Mass", "typical_range": "about 30-50 light Italian; 50-90 large French/English/German doubles", "unit": "kg" }, { "quantity": "A4 pitch in use", "typical_range": "392 (French Baroque 'low'), 415 (common HIP), 440 (modern), 466 (some high Italian/German)", "unit": "Hz" }, { "quantity": "Stop disposition (string choirs)", "typical_range": "1-4 choirs, notated in organ feet as 8', 4' and sometimes 16' plus buff/lute", "unit": "foot-length choirs" }, { "quantity": "Number of manuals", "typical_range": "1 or 2; 3 is exceptional (Hass)", "unit": "count" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Plectra wear, break or lose voicing; quill and Delrin tongues need regular replacement and voicing.", "Jacks stick in the register in high humidity or rattle when too dry; dampers fail to seat and notes ring on.", "Strings break (especially hard-drawn iron at high pitch); tuning pins slip in a dry wrestplank.", "Soundboard cracks, bridge debonding and case joints opening under relative-humidity swing - the main conservation failure of historic instruments.", "Woodworm, failed animal glue, and lid or leg breakage in transport.", "Lead jack weights and historic lead-white or vermilion paint are toxic if abraded or handled without care.", "Instrument mass and a hinged lid cause crush and strain injuries when moved or when the lid stick is dislodged.", "CITES/ivory and protected-wood parts create legal seizure risk in cross-border loan and sale, not a playing hazard." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-regional-variation", "name": "Regional variation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "English harpsichord; French clavecin; Italian cembalo/clavicembalo; German Cembalo or Kielflügel; Spanish clave/clavecín; Dutch klavecimbel; Portuguese cravo.", "Italian practice favours light inner-outer (or false inner-outer) cases and short scaling; Flemish and French instruments are heavier, longer-scaled, and more often two-manual.", "French workshops commonly enlarged (ravalement) older Ruckers instruments rather than building wholly new large doubles.", "English instruments characteristically add a machine stop and sometimes a Venetian swell; German Hamburg makers more often include a 16' choir.", "Pitch and temperament: Italian and early ensembles often in quarter-comma meantone; French Baroque frequently near A392; modern HIP default A415; some church and court contexts used choir pitch around A466." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "name": "Fortepiano / piano", "difference": "Hammers strike strings and loudness follows key velocity; a harpsichord plucks with a jack and does not." }, { "name": "Clavichord", "difference": "A tangent strikes the string and remains in contact (allowing Bebung); the sound is much quieter and there is no jack or plectrum." }, { "name": "Virginal", "difference": "Oblong (or polygonal) case with strings running roughly parallel to the keyboard, usually one choir; a harpsichord is wing-shaped with strings running away from the player." }, { "name": "Spinet (bentside or pentagonal)", "difference": "Strings set at an angle to the keyboard, typically a single 8' choir and no second manual; the harpsichord's wrestplank and longer scaling sit at right angles to the keys." }, { "name": "Lautenwerk (lute-harpsichord)", "difference": "Same jack action but gut (or gut-and-brass) stringing and a lute-like body/timbration, not a wire-strung wing with a soundboard in the harpsichord sense." }, { "name": "Pipe organ (continuo stand-in)", "difference": "Wind-blown pipes with a sustained tone for as long as the key is held; the harpsichord tone decays after the pluck." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of harpsichord this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Does the authoritative registry include spinets, virginals and other related plucked keyboard forms within harpsichord, or assign them to neighbouring entries?", "Does an existing Vercy world model already cover this concept and therefore need to be linked instead of duplicated?", "What evidence and terminology should distinguish original instruments, historical copies, reconstructions and later conversions?", "Which assessment methods can establish acceptable action response and voicing without imposing one instrument tradition's preferences on another?", "What instrument-specific sources should govern pitch limits, environmental conditions and decisions to restrict playing or intervention?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 29 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "device, machine or tool", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a harpsichord, record what state it is in, and decide what may be done with it.", "whatItIs": "Enable an AI agent to recognise a harpsichord, assess its musical and material readiness, and determine which playing, adjustment, maintenance or conservation actions are appropriate.", "characteristics": { "substance": "material", "origin": "manufactured", "agency": "inert", "mobility": "varies" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: Musikhaus Kurt Sperrhake, pedal harpsichord, Spinettone, clavicytherium, ottavino, spinet, octave spinet, oval spinet.", "8 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 92 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a harpsichord, and on what evidence are they told apart?" ], "whatItIsMadeOf": "matter you can touch", "physicalCharacter": [ "Mobility varies between examples.", "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Recognised by form, by the arrangement of its controls, and by markings - a plate, a model number, a certification mark. Form alone rarely separates two models that do very different things." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "Musikhaus Kurt Sperrhake", "pedal harpsichord", "Spinettone", "clavicytherium", "ottavino", "spinet", "octave spinet", "oval spinet" ] } ], "standing": "Described in 92 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 8 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one harpsichord from another, and a harpsichord from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a harpsichord sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a harpsichord from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "form-and-composition", "name": "Form, composition and condition", "description": "What a harpsichord is made of, what shape and size it takes, and what state it is in.", "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.", "layers": [ { "id": "form-and-dimensions", "name": "Form and dimensions", "description": "Shape, size, mass and the ranges these take across examples.", "findings": [ { "id": "measurable-dimensions", "name": "Measurable dimensions and their units", "description": "The quantities worth recording and the units they are recorded in.", "questions": [ { "id": "measurable-dimensions-q01", "text": "What identifies and describes the dimensions of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "measurable-dimensions-q02", "text": "Who or what asserted this about the dimensions of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "measurable-dimensions-q03", "text": "What may an agent decide or do once the dimensions of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "material-and-composition", "name": "Material and composition", "description": "Materials, parts and how they are put together.", "findings": [ { "id": "parts-and-materials", "name": "Parts and materials", "description": "What a harpsichord is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "parts-and-materials-q02", "text": "Who or what asserted this about the composition of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "parts-and-materials-q03", "text": "What may an agent decide or do once the composition of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "condition-and-integrity", "name": "Condition and integrity", "description": "Wear, damage, health and the difference between working and broken.", "findings": [ { "id": "condition-assessment", "name": "Condition, damage and health", "description": "How the condition of a harpsichord is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "condition-assessment-q02", "text": "Who or what asserted this about the condition of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "condition-assessment-q03", "text": "What may an agent decide or do once the condition of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "place-and-movement", "name": "Place and movement", "description": "Where a harpsichord is, how it got there and where it may go (varies).", "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.", "layers": [ { "id": "location-and-placement", "name": "Location and placement", "description": "Position, containment and the reference frame the position is given in.", "findings": [ { "id": "position-and-frame", "name": "Position, container and reference frame", "description": "Where a harpsichord is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "position-and-frame-q02", "text": "Who or what asserted this about the location of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "position-and-frame-q03", "text": "What may an agent decide or do once the location of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "movement-and-transfer", "name": "Movement and transfer", "description": "How a harpsichord is carried, installed or relocated.", "findings": [ { "id": "movement-events", "name": "Movement events and constraints", "description": "What counts as a movement, what records it and what limits it.", "questions": [ { "id": "movement-events-q01", "text": "What identifies and describes the movement of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "movement-events-q02", "text": "Who or what asserted this about the movement of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "movement-events-q03", "text": "What may an agent decide or do once the movement of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a harpsichord passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a harpsichord between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a harpsichord, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a harpsichord is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "function-and-principle", "name": "Function and operating principle", "description": "What harpsichord is for and how it achieves it.", "rationale": "Two devices with the same name can work on different principles, and the principle is what predicts failure and constrains use.", "layers": [ { "id": "intended-function", "name": "Intended function", "description": "The job it does, and the jobs it is used for anyway.", "findings": [ { "id": "function-record", "name": "Function, principle and variants", "description": "What it does, how, and which variants do it differently.", "questions": [ { "id": "function-record-q01", "text": "What function does harpsichord perform, on what operating principle, and which variants differ in that principle?", "kind": "definition" }, { "id": "function-record-q02", "text": "What use falls outside the intended function but happens in practice?", "kind": "boundary" } ] } ] }, { "id": "capacity-and-rating", "name": "Capacity and rating", "description": "The numbers that say what it can do and where it stops.", "findings": [ { "id": "ratings", "name": "Ratings and their conditions", "description": "Rated capacity, power, throughput and the conditions each assumes.", "questions": [ { "id": "ratings-q01", "text": "What ratings characterise harpsichord, in what units, and under what stated conditions?", "kind": "measurement" }, { "id": "ratings-q02", "text": "What happens beyond the rating - degradation, refusal, damage - and how is that detected?", "kind": "action" } ] } ] } ] }, { "id": "operation-and-state", "name": "Operation, controls and state", "description": "How harpsichord is operated and what state it is in right now.", "rationale": "An agent acting on a device needs its current state and the controls that change it, not just its specification.", "layers": [ { "id": "controls-and-modes", "name": "Controls and modes", "description": "What can be set, what that changes, and what is interlocked.", "findings": [ { "id": "control-surface", "name": "Control surface and interlocks", "description": "The settings available and the conditions that block them.", "questions": [ { "id": "control-surface-q01", "text": "What controls and modes does harpsichord have, and what does each change?", "kind": "definition" }, { "id": "control-surface-q02", "text": "Which actions are interlocked or forbidden in which state, and what must be true before acting?", "kind": "action" } ] } ] }, { "id": "condition-and-maintenance", "name": "Condition and maintenance", "description": "Wear, service intervals, consumables and the line between working and broken.", "findings": [ { "id": "service-record", "name": "Condition, service and consumables", "description": "What is consumed, what is serviced, and how condition is judged.", "questions": [ { "id": "service-record-q01", "text": "What consumables and service does harpsichord need, at what interval, and on whose authority?", "kind": "measurement" }, { "id": "service-record-q02", "text": "What evidence separates a unit that is working from one that is out of service?", "kind": "boundary" } ] } ] } ] }, { "id": "kind-model-unit", "name": "Kind, model and unit", "description": "Whether a claim about harpsichord is about the kind, a product line, or one physical unit.", "rationale": "This is the boundary most often got wrong for made things, and getting it wrong mixes a catalogue entry with the machine in the yard.", "layers": [ { "id": "level-of-reference", "name": "Level of reference", "description": "The three levels and what belongs at each.", "findings": [ { "id": "level-rules", "name": "What belongs to kind, model and unit", "description": "Which properties are shared by all of them and which are not.", "questions": [ { "id": "level-rules-q01", "text": "Which facts about harpsichord hold for every one of them, which for a model, and which only for one unit?", "kind": "boundary" }, { "id": "level-rules-q02", "text": "What identifies an individual unit, and what should an agent do when it has only the kind?", "kind": "action" } ] } ] }, { "id": "standards-and-conformity", "name": "Standards and conformity", "description": "The standards a working example must meet and who attests it.", "findings": [ { "id": "conformity", "name": "Standards, marks and attestation", "description": "Which standard applies, who certifies, and what the mark means.", "questions": [ { "id": "conformity-q01", "text": "Which standards govern harpsichord, issued by whom, and what does conformity actually assert?", "kind": "provenance" }, { "id": "conformity-q02", "text": "What may an agent conclude from a certification mark, and what may it not?", "kind": "boundary" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a harpsichord came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a harpsichord and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a harpsichord is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a harpsichord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a harpsichord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a harpsichord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 8, "layers": 17, "findings": 19, "questions": 51 } } } }