Foucault pendulum
E758294
The Foucault pendulum is a long, freely swinging pendulum that dramatically demonstrates Earth's rotation by slowly changing the direction of its swing relative to the ground.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Foucault pendulum canonical | 3 |
| Il pendolo di Foucault | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T8803790 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Foucault pendulum Context triple: [Léon Foucault, knownFor, Foucault pendulum]
-
A.
Astronomical Clock
The Astronomical Clock in Prague is a medieval timepiece and astronomical instrument famous for its intricate mechanical design and hourly animated figures, making it one of the city’s most iconic landmarks.
-
B.
Cosmo Clock 21 Ferris wheel
Cosmo Clock 21 Ferris wheel is a giant Ferris wheel and former world’s largest, notable for its illuminated clock and panoramic views over Yokohama’s Minato Mirai waterfront district.
-
C.
Tower of Winds
The Tower of Winds is a landmark experimental structure in Yokohama, Japan, that uses perforated aluminum panels and computer-controlled lighting to transform a ventilation shaft into a dynamic, light-responsive urban sculpture.
-
D.
Orrery
An orrery is a mechanical model of the solar system that illustrates the relative motions of the planets and moons around the Sun.
-
E.
Monument of Light
The Monument of Light is a tall, stainless-steel needle-like sculpture in central Dublin that serves as a prominent modern landmark on O'Connell Street.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Foucault pendulum Target entity description: The Foucault pendulum is a long, freely swinging pendulum that dramatically demonstrates Earth's rotation by slowly changing the direction of its swing relative to the ground.
-
A.
Astronomical Clock
The Astronomical Clock in Prague is a medieval timepiece and astronomical instrument famous for its intricate mechanical design and hourly animated figures, making it one of the city’s most iconic landmarks.
-
B.
Cosmo Clock 21 Ferris wheel
Cosmo Clock 21 Ferris wheel is a giant Ferris wheel and former world’s largest, notable for its illuminated clock and panoramic views over Yokohama’s Minato Mirai waterfront district.
-
C.
Tower of Winds
The Tower of Winds is a landmark experimental structure in Yokohama, Japan, that uses perforated aluminum panels and computer-controlled lighting to transform a ventilation shaft into a dynamic, light-responsive urban sculpture.
-
D.
Orrery
An orrery is a mechanical model of the solar system that illustrates the relative motions of the planets and moons around the Sun.
-
E.
Monument of Light
The Monument of Light is a tall, stainless-steel needle-like sculpture in central Dublin that serves as a prominent modern landmark on O'Connell Street.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
pendulum
ⓘ
physics experiment ⓘ scientific demonstration ⓘ |
| component |
damping compensation mechanism
ⓘ
fixed support ⓘ launch mechanism ⓘ long cable ⓘ massive bob ⓘ |
| demonstrates | Earth's rotation ⓘ |
| exhibits | precession of swing plane ⓘ |
| field |
classical mechanics
ⓘ
physics education ⓘ |
| firstDemonstratedBy | Léon Foucault NERFINISHED ⓘ |
| firstPublicDemonstrationLocation | Panthéon, Paris NERFINISHED ⓘ |
| firstPublicDemonstrationYear | 1851 ⓘ |
| hasEducationalUse | visual demonstration of Earth's rotation ⓘ |
| hasProperty |
freely swinging
ⓘ
large amplitude of swing ⓘ long period of oscillation ⓘ minimal air resistance ⓘ minimal friction ⓘ oscillates in a vertical plane ⓘ suspension point fixed to Earth ⓘ |
| namedAfter | Léon Foucault NERFINISHED ⓘ |
| oftenLocatedIn |
planetariums
ⓘ
public buildings ⓘ science museums ⓘ universities ⓘ |
| precessionDueTo |
Coriolis effect
NERFINISHED
ⓘ
Earth's rotation ⓘ |
| precessionRate |
maximum at geographic poles
ⓘ
zero at equator ⓘ |
| precessionRateDependsOn | latitude ⓘ |
| relatedConcept |
Coriolis effect
NERFINISHED
ⓘ
Earth's rotation axis NERFINISHED ⓘ inertial frame of reference ⓘ non-inertial frame of reference ⓘ |
| requires |
careful alignment at start
ⓘ
rigid building structure ⓘ very long suspension length ⓘ |
| swingPlaneAppearsToRotate | relative to Earth's surface ⓘ |
| swingPlaneIsFixedIn | inertial space (approximately) ⓘ |
| typicalBobMass | tens of kilograms or more GENERATED ⓘ |
| typicalCableLength | several meters to tens of meters GENERATED ⓘ |
| usedToIllustrate |
Coriolis force
NERFINISHED
ⓘ
inertial reference frame ⓘ non-inertial reference frame ⓘ |
| usedToTest | rotation of Earth ⓘ |
| uses | long pendulum ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Foucault pendulum Description of subject: The Foucault pendulum is a long, freely swinging pendulum that dramatically demonstrates Earth's rotation by slowly changing the direction of its swing relative to the ground.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Umberto Eco
this entity surface form:
Il pendolo di Foucault
this entity surface form:
Il pendolo di Foucault