Mark 4 nuclear bomb
E854463
The Mark 4 nuclear bomb was an early U.S. post–World War II fission weapon derived from the Fat Man design and used during the early Cold War.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mark 4 nuclear bomb canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T10223459 — 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: Mark 4 nuclear bomb Context triple: [Nuclear bombs of the United States, hasPart, Mark 4 nuclear bomb]
-
A.
Mark 1 nuclear bomb
The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
-
B.
Mark 3 nuclear bomb
The Mark 3 nuclear bomb was an early U.S. atomic weapon, a production version of the "Fat Man" design used at the end of World War II.
-
C.
B43 nuclear bomb
The B43 nuclear bomb is a U.S. Cold War–era air-dropped thermonuclear weapon designed for use by tactical and strategic aircraft.
-
D.
B41 nuclear bomb
The B41 nuclear bomb was a high-yield, Cold War–era American thermonuclear gravity bomb and one of the most powerful nuclear weapons ever deployed by the United States.
-
E.
Mark 8 nuclear bomb
The Mark 8 was an early American nuclear bomb design, notable as a gun-type fission weapon developed in the early Cold War era.
- 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: Mark 4 nuclear bomb Target entity description: The Mark 4 nuclear bomb was an early U.S. post–World War II fission weapon derived from the Fat Man design and used during the early Cold War.
-
A.
Mark 1 nuclear bomb
The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
-
B.
Mark 3 nuclear bomb
The Mark 3 nuclear bomb was an early U.S. atomic weapon, a production version of the "Fat Man" design used at the end of World War II.
-
C.
B43 nuclear bomb
The B43 nuclear bomb is a U.S. Cold War–era air-dropped thermonuclear weapon designed for use by tactical and strategic aircraft.
-
D.
B41 nuclear bomb
The B41 nuclear bomb was a high-yield, Cold War–era American thermonuclear gravity bomb and one of the most powerful nuclear weapons ever deployed by the United States.
-
E.
Mark 8 nuclear bomb
The Mark 8 was an early American nuclear bomb design, notable as a gun-type fission weapon developed in the early Cold War era.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
fission bomb
ⓘ
gravity bomb ⓘ nuclear weapon ⓘ |
| alsoKnownAs | Mk 4 bomb ⓘ |
| conflict | Cold War ⓘ |
| coreType | composite plutonium-uranium core ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| deliveryMethod | air-dropped ⓘ |
| deploymentPlatform |
B-29 Superfortress
ⓘ
B-36 Peacemaker ⓘ
linked to:
Convair B-36 Peacemaker
B-47 Stratojet ⓘ B-50 Superfortress ⓘ P2V Neptune ⓘ |
| derivedFrom |
Fat Man nuclear bomb
ⓘ
linked to:
Fat Man
|
| designer | Los Alamos Laboratory ⓘ |
| detonationMethod |
air burst
ⓘ
contact burst ⓘ |
| diameter |
1.52 meters
ⓘ
60 inches ⓘ |
| feature |
improved ease of assembly compared to Fat Man
ⓘ
interchangeable nuclear cores with different yields ⓘ modular design ⓘ |
| filling | high explosive lenses ⓘ |
| guidanceSystem | unguided ⓘ |
| hasVariant |
Mark 4 Mod 0
ⓘ
Mark 4 Mod 1 ⓘ
linked to:
Mark 4 Mod 0
Mark 4 Mod 2 ⓘ
linked to:
Mark 4 Mod 0
Mark 4 Mod 3 ⓘ
linked to:
Mark 4 Mod 0
|
| length |
128 inches
ⓘ
3.25 meters ⓘ |
| natoDesignation | Mk 4 ⓘ |
| operator |
United States Air Force
ⓘ
United States Navy ⓘ |
| precededBy |
Fat Man nuclear bomb
ⓘ
linked to:
Fat Man
|
| producedUnits |
approximately 550
ⓘ
over 500 ⓘ |
| productionEnd | 1953 ⓘ |
| productionStart | 1949 ⓘ |
| replacedBy | Mark 6 nuclear bomb ⓘ |
| retired | mid-1950s ⓘ |
| safetyFeature | removable nuclear core ⓘ |
| serviceEntry | 1949 ⓘ |
| technologyGeneration | second-generation U.S. nuclear weapon ⓘ |
| usedBy | Strategic Air Command ⓘ |
| usedInPeriod | early Cold War ⓘ |
| warheadType | plutonium implosion ⓘ |
| weight |
approximately 10,000 pounds
ⓘ
approximately 4.5 tonnes ⓘ |
| yield | between 1 kiloton and 31 kilotons of TNT ⓘ |
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: Mark 4 nuclear bomb Description of subject: The Mark 4 nuclear bomb was an early U.S. post–World War II fission weapon derived from the Fat Man design and used during the early Cold War.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.