hourglass
Enable an agent to recognise an hourglass, assess whether it can reliably time an interval, and decide how to operate, inspect or care for it.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise an hourglass, assess whether it can reliably time an interval, and decide how to operate, inspect or care for it.
An hourglass is a passive interval timer in which granular material flows under gravity through a narrow passage between two connected chambers, with the transfer of a calibrated charge marking a nominal elapsed time.
It can be Invert and position the hourglass to begin a full interval from a verified starting charge distribution.; Observe grain transfer and distinguish completion from stalled flow.; Compare repeated runs with a reference timer in both inversion directions.; Assess whether a run remains usable after tilting, shaking or premature inversion.; Inspect chambers, seals, frame and support surfaces before handling or continued use.; Remove a damaged or unreliable hourglass from timing service and identify documented care options..
Distinguishing features
Has two connected chambers and a restricted passage through which a granular charge can transfer.
Measures an interval through gravity-driven movement of grains rather than liquid flow, gears or electronic counting.
Can ordinarily begin another full run by inversion after the charge has finished transferring.
Primarily indicates progress toward completion of an interval rather than the time of day.
An hourglass-shaped vessel without a functioning granular transfer path is a representation or decorative form, not automatically a working timer.
Scope
+ Paired chambers, connecting constriction, granular charge, enclosure and supporting frame
+ Timing by gravity-driven transfer and resetting by inversion
+ Nominal duration, observed duration, repeatability and timing endpoints
+ Orientation, transfer progress, blockage, leakage and physical damage
+ Suitability for a stated timing task and permitted handling or maintenance
- Water clocks and other liquid-transfer timers
- Mechanical, electronic and software timers
- Hourglass icons, cursor animations and symbolic representations of time
- Granular materials as independently catalogued substances
- Product lines, individual asset histories and manufacturing businesses
- The activity being timed, including its independent safety requirements
Characteristics
- Functional classification
- working interval timer | decorative hourglass | unverified Prevents visual resemblance from being treated as evidence of usable timing performance.
- Nominal interval
- s or min; include whether marked, documented or unknown Expresses the intended interval without assuming that the name hourglass means sixty minutes.
- Observed full-run interval
- s; recorded with orientation, start and finish criteria, and reference timer Establishes actual timing behaviour under stated conditions.
- Repeatability
- s; range or standard deviation across a stated number of runs Shows whether successive uses can support the required timing tolerance.
- Directional timing difference
- s between mean full-run intervals in the two inversion directions Checks whether either end may be used interchangeably for the intended task.
- Granular charge
- documented material and grain description | visually described | unknown Supports recognition and fault investigation without assuming that every charge is sand.
- Chamber and constriction configuration
- chamber materials, passage arrangement and visible geometry Identifies the physical transfer mechanism and accessible inspection points.
- Run state
- ready | flowing | completed | stalled | interrupted | indeterminate Separates a completed interval from a stopped or invalid run.
- Operating orientation
- degrees from vertical; identify upper chamber Records the setup associated with observed flow and timing.
- Enclosure integrity
- intact | cracked | leaking | loose joint | uncertain Determines whether handling or further timing use is appropriate.
- Timing-task suitability
- relationship to a task specifying required interval and permitted timing error Makes usability depend on the task's tolerance and demonstrated performance.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.hourglass
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 16 findings · 30 questions.
Identity and timing boundary Establishes which physical devices count as hourglasses and what their timing claim covers.
The name and silhouette alone do not establish a working timer or a one-hour interval.
Physical recognition
Recognises the granular transfer arrangement and separates it from look-alike objects.
Granular transfer identity
Recognition should establish paired chambers, a connecting constriction and a granular charge, while recording whether transfer actually works.
- Does the object have two chambers connected by a passage that permits granular transfer? definition
- Is this a working hourglass, a decorative example, or an hourglass-shaped object without a timing mechanism? boundary
Interval claim
Separates the intended elapsed interval from the object's name and appearance.
Stated duration
The intended interval needs an explicit basis; it should not be inferred from the word hourglass.
- What nominal duration, if any, is marked on the hourglass or stated in its documentation? provenance
- Does the timing claim apply to complete transfer only, or also to intermediate marks? boundary
Chambers, charge and support Describes the parts that contain, restrict and support granular transfer.
Hourglass behaviour depends on the charge and transfer path, while safe inversion depends on the enclosure and support.
Transfer path
Records the granular charge and the chamber-to-chamber passage.
Charge and constriction
The charge and narrow passage should be described from inspection or documentation, with inaccessible details left unknown.
- What evidence identifies the charge material, rather than merely its colour or appearance? provenance
- What can be observed or documented about the constriction and its freedom from obstruction? measurement
Containment and standing
Records how the chambers retain their contents and stand in either operating direction.
Enclosure and inversion support
Chamber material, joints, frame and resting surfaces determine how the hourglass can be supported and inverted.
- Which parts contain the grains, and which parts provide grip or support during inversion? definition
- Can the hourglass stand securely in both intended operating orientations without loading a damaged part? action
Run cycle and observation Defines a valid start, observable progress and an interpretable finish.
A stopped stream may mean completion or blockage, and partial inversion does not automatically start a known interval.
Starting and resetting
Establishes the initial charge distribution and the inversion procedure.
Full-run start
A full-duration run needs a defined starting distribution and a consistent event from which elapsed time is measured.
- How is readiness confirmed before inversion, including any grains retained in the chamber that should be empty? action
- Is the start recorded at inversion, placement, or first observed grain flow? measurement
Progress and completion
Interprets the visible stream and remaining charge without assuming a calibrated intermediate scale.
Completion versus stall
Completion requires a defined endpoint and inspection of remaining transferable charge; absence of flow alone is insufficient.
- When flow stops, is transferable charge still present above the constriction? measurement
- What visible event defines completion, including treatment of isolated late-falling grains? definition
- What evidence supports converting visible charge distribution or intermediate markings into elapsed time? provenance
Timing performance and use Connects measured timing behaviour with the requirements of a proposed use.
An hourglass can transfer grains successfully yet fail to meet the interval or consistency required by a task.
Duration and repeatability
Measures full runs under recorded conditions and checks both directions.
Reference timing
Performance assessment should retain individual run results, timing endpoints and direction rather than a single unsupported accuracy claim.
- What full-run durations are measured against a reference timer over repeated runs in each direction? measurement
- What orientation, handling and endpoint rules were used for those measurements? provenance
Task fit and interruption
Determines whether demonstrated performance and handling history support a timing decision.
Usable interval
A usable run must satisfy the task's timing tolerance and have an acceptable start and uninterrupted operating history.
- What interval and maximum timing error does the intended task permit? boundary
- Do observed duration and variability satisfy that requirement? measurement
- After tilting, shaking, stalled flow or premature inversion, should the run be discarded and restarted? action
Faults and care Supports inspection, fault recognition and care appropriate to the particular hourglass.
Grain retention, obstruction and enclosure damage affect timing and may make further handling unsuitable.
Flow and integrity faults
Separates observed symptoms from unverified explanations.
Fault evidence
Record clumping, wall adhesion, interrupted flow, lost charge and physical damage as observations before assigning a cause.
- Are grains clumped, adhering to chamber walls, or remaining above a passage with no continuing flow? measurement
- Are there cracks, escaping grains, loose joints or an unstable supporting frame? measurement
- Which observations require stopping timing use or avoiding further inversion? action
Service and requalification
Defines documented care options and checks needed after changes to the transfer system.
Permitted care
Opening, refilling or modifying an hourglass should depend on its construction and documented service provisions; altered timing requires reassessment.
- Is the hourglass sealed or explicitly designed for opening, adjustment or charge replacement? provenance
- What cleaning, storage and handling methods are documented for its chamber, seals and frame? action
- What timing checks are required before returning a repaired or modified hourglass to its intended task? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This describes the physical timer kind; an hourglass need not measure exactly one hour.
- The stated interval range is illustrative of common products, not a specification or a limit; accuracy and repeatability require measurement of the particular unit.
- Filling materials vary and are not necessarily ordinary sand; no hourglass-specific standard or universal identifier is confidently recalled.
- Which of these check these first hold for the sense of hourglass this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Marine sandglass
- Egg timer
- Board-game sand timer
- Sauna sand timer
- Decorative hourglass
- Which of these kinds and varieties hold for the sense of hourglass this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Timing short cooking tasks
- Limiting turns in games and timed activities
- Timing sauna sessions
- Historically timing shipboard watches and intervals used in measuring vessel speed
- Visually representing the passage of time
- Which of these real-world use hold for the sense of hourglass this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Nominal timing interval for common household and activity timers - 1-60 - min
- Which of these typical measurements hold for the sense of hourglass this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Moisture ingress can make the granular material clump and interrupt flow.
- Particles can bridge or obstruct the narrow passage, stopping the timer.
- Tilt, vibration, or shaking can alter flow and impair repeatability.
- Damage to the constriction or loss of filling material can change the timing interval.
- Glass breakage can cause cuts and release the filling material.
- Which of these failure modes and hazards hold for the sense of hourglass this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Water clock - Uses liquid flow or changing liquid level rather than granular flow to measure time.
- Mechanical timer - Uses a mechanical timing mechanism, commonly driven by a wound spring, rather than material passing through a constriction.
- Sundial - Indicates solar time through the position of a shadow rather than measuring an interval through granular transfer.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of hourglass this model covers, and on what evidence? provenance
What the second pass must settle
- Does an existing Vercy world model already cover the physical hourglass concept and therefore provide the authoritative publication for this registry entry?
- Which primary sources establish common hourglass charge materials, constriction designs and documented causes of timing variation?
- Are there applicable hourglass-specific performance standards, or only requirements tied to particular products and uses?
- What evidence supports typical durations, dimensions and achievable repeatability for distinct hourglass classes?
- Which designs provide validated intermediate timing marks, serviceable charges or equivalent timing in both inversion directions?