Saybrook Breakwater Light
E360390
Saybrook Breakwater Light is a historic offshore lighthouse marking the mouth of the Connecticut River on Long Island Sound.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Saybrook Breakwater Light canonical | 2 |
| Saybrook Outer Light | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3422563 — 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: Saybrook Breakwater Light Context triple: [Old Saybrook, Connecticut, hasLandmark, Saybrook Breakwater Light]
-
A.
Nauset Light
Nauset Light is a historic, red-and-white lighthouse on Cape Cod in Massachusetts, known as an iconic coastal landmark and symbol of the region.
-
B.
Mission Point Light
Mission Point Light is a historic lighthouse located at the tip of Old Mission Peninsula in Grand Traverse Bay, Michigan, known for its picturesque setting and 19th-century architecture.
-
C.
Brant Point Light
Brant Point Light is a historic lighthouse on Nantucket Island, Massachusetts, guiding vessels into Nantucket Harbor and known as one of the oldest lighthouse sites in the United States.
-
D.
Sand Island Light
Sand Island Light is a historic lighthouse located on Sand Island in Lake Superior, known for guiding ships through the Apostle Islands region of Wisconsin.
-
E.
Long Point Light
Long Point Light is a historic lighthouse marking the entrance to Provincetown Harbor at the tip of Cape Cod, Massachusetts.
- 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: Saybrook Breakwater Light Target entity description: Saybrook Breakwater Light is a historic offshore lighthouse marking the mouth of the Connecticut River on Long Island Sound.
-
A.
Nauset Light
Nauset Light is a historic, red-and-white lighthouse on Cape Cod in Massachusetts, known as an iconic coastal landmark and symbol of the region.
-
B.
Mission Point Light
Mission Point Light is a historic lighthouse located at the tip of Old Mission Peninsula in Grand Traverse Bay, Michigan, known for its picturesque setting and 19th-century architecture.
-
C.
Brant Point Light
Brant Point Light is a historic lighthouse on Nantucket Island, Massachusetts, guiding vessels into Nantucket Harbor and known as one of the oldest lighthouse sites in the United States.
-
D.
Sand Island Light
Sand Island Light is a historic lighthouse located on Sand Island in Lake Superior, known for guiding ships through the Apostle Islands region of Wisconsin.
-
E.
Long Point Light
Long Point Light is a historic lighthouse marking the entrance to Provincetown Harbor at the tip of Cape Cod, Massachusetts.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
historic place
ⓘ
lighthouse ⓘ offshore lighthouse ⓘ |
| addedToNationalRegisterOfHistoricPlaces | 1990 ⓘ |
| alsoKnownAs |
Outer Light
ⓘ
Saybrook Outer Light ⓘ
linked to:
Saybrook Breakwater Light
|
| automated | 1959 ⓘ |
| category |
Lighthouses in Connecticut
ⓘ
Lighthouses on the National Register of Historic Places in Connecticut ⓘ Transportation buildings and structures in Middlesex County, Connecticut ⓘ |
| constructionMaterial |
cast iron
ⓘ
concrete foundation ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| county | Middlesex County, Connecticut ⓘ |
| currentLensType | modern optic ⓘ |
| focalHeight | 58 feet ⓘ |
| foundationType | cylindrical concrete caisson ⓘ |
| function | warns mariners of rocks and shoals near the river mouth ⓘ |
| hasFeature |
cylindrical cast-iron tower
ⓘ
gallery deck around lantern ⓘ porthole-style windows ⓘ |
| height |
15 meters
ⓘ
about 49 feet ⓘ |
| lanternColor | black ⓘ |
| lightCharacteristic | flashing white every 6 seconds ⓘ |
| locatedIn |
Connecticut
ⓘ
United States ⓘ
linked to:
United States of America
|
| locatedOnWaterbody | Long Island Sound ⓘ |
| location |
Old Saybrook, Connecticut
ⓘ
linked to:
Old Saybrook, Connecticut, United States
|
| managingAgent | United States Coast Guard ⓘ |
| marks | mouth of the Connecticut River ⓘ |
| navigationalRegion | Long Island Sound ⓘ |
| nearestCity |
Old Saybrook, Connecticut
ⓘ
linked to:
Old Saybrook, Connecticut, United States
|
| originalLensType | fourth-order Fresnel lens ⓘ |
| originalPowerSource | kerosene ⓘ |
| owner | United States Coast Guard ⓘ |
| powerSource | electric ⓘ |
| purpose | aid to navigation ⓘ |
| referenceNumberNRHP | 89001470 ⓘ |
| servesAs | aid to navigation for vessels entering the Connecticut River ⓘ |
| situatedOn | breakwater at the mouth of the Connecticut River ⓘ |
| state | Connecticut ⓘ |
| towerColor | white ⓘ |
| towerShape | conical ⓘ |
| yearEstablished | 1886 ⓘ |
| yearLit | 1886 ⓘ |
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: Saybrook Breakwater Light Description of subject: Saybrook Breakwater Light is a historic offshore lighthouse marking the mouth of the Connecticut River on Long Island Sound.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.