Difference Engine No. 2
E587740
Difference Engine No. 2 is Charles Babbage’s later, more advanced mechanical calculating machine design, created in the 1840s to reliably compute and print mathematical tables.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Difference Engine No. 2 canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T6327983 — 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: Difference Engine No. 2 Context triple: [Difference Engine, designGeneration, Difference Engine No. 2]
-
A.
Difference Engine No. 1
Difference Engine No. 1 is Charles Babbage’s early 19th-century mechanical calculator prototype, designed to automatically compute and tabulate polynomial functions.
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B.
The Bell
The Bell is a prominent rock peak in South Africa’s Drakensberg range, known for its striking bell-like shape and challenging hiking and climbing routes.
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C.
The Machine of the World
The Machine of the World is a famous allegorical vision in Luís de Camões’ epic poem *Os Lusíadas*, in which the cosmos and its secrets are revealed to the Portuguese explorers.
-
D.
The Wheel
The Wheel is a prominent observation wheel attraction at ICON Park in Orlando, offering panoramic views of the city and surrounding area.
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E.
The Iron Horse
The Iron Horse is the legendary New York Yankees first baseman Lou Gehrig, renowned for his durability, power hitting, and record-setting consecutive games played streak.
- 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: Difference Engine No. 2 Target entity description: Difference Engine No. 2 is Charles Babbage’s later, more advanced mechanical calculating machine design, created in the 1840s to reliably compute and print mathematical tables.
-
A.
Difference Engine No. 1
Difference Engine No. 1 is Charles Babbage’s early 19th-century mechanical calculator prototype, designed to automatically compute and tabulate polynomial functions.
-
B.
The Bell
The Bell is a prominent rock peak in South Africa’s Drakensberg range, known for its striking bell-like shape and challenging hiking and climbing routes.
-
C.
The Machine of the World
The Machine of the World is a famous allegorical vision in Luís de Camões’ epic poem *Os Lusíadas*, in which the cosmos and its secrets are revealed to the Portuguese explorers.
-
D.
The Wheel
The Wheel is a prominent observation wheel attraction at ICON Park in Orlando, offering panoramic views of the city and surrounding area.
-
E.
The Iron Horse
The Iron Horse is the legendary New York Yankees first baseman Lou Gehrig, renowned for his durability, power hitting, and record-setting consecutive games played streak.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
computing machine design
ⓘ
difference engine ⓘ mechanical calculator ⓘ |
| basedOn | method of finite differences ⓘ |
| category |
19th-century computing device
ⓘ
historical calculator ⓘ |
| computesUsing |
base-10 representation
ⓘ
mechanical addition ⓘ mechanical carry propagation ⓘ |
| constructedBy | Science Museum, London ⓘ |
| constructionStatus | not built in Babbage’s lifetime ⓘ |
| countryOfOrigin | United Kingdom ⓘ |
| demonstrates | feasibility of large-scale mechanical computation ⓘ |
| designedInPeriod | 1840s ⓘ |
| designer | Charles Babbage ⓘ |
| documentedIn |
Babbage’s notebooks
ⓘ
Science Museum technical reports ⓘ
linked to:
Science Museum Group
|
| exhibitedAt |
Computer History Museum
ⓘ
Science Museum, London ⓘ |
| fieldOfUse |
astronomy
ⓘ
mathematics ⓘ navigation ⓘ |
| firstCompleteConstruction | 1991 ⓘ |
| follows | Difference Engine No. 1 ⓘ |
| hasApproximateDepth | 1 meter ⓘ |
| hasApproximateHeight | 3 meters ⓘ |
| hasApproximateWeight | 2.5 tonnes ⓘ |
| hasApproximateWidth | 2 meters ⓘ |
| hasPart |
control mechanism
ⓘ
decimal digit wheels ⓘ gear trains ⓘ printing mechanism ⓘ |
| inception |
1847
ⓘ
1849 ⓘ |
| isPartOf | history of computing ⓘ |
| materialUsed |
brass
ⓘ
steel ⓘ |
| maximumDigitsPerNumber | 31 ⓘ |
| maximumOrderOfDifferences | 7 ⓘ |
| notableFor |
error reduction in table production
ⓘ
improved efficiency over Difference Engine No. 1 ⓘ integrated printing of results ⓘ |
| numberOfColumns | 8 ⓘ |
| powerSource | manual crank ⓘ |
| purpose |
to compute mathematical tables
ⓘ
to print mathematical tables ⓘ |
| relatedTo |
Analytical Engine
ⓘ
Difference Engine No. 1 ⓘ |
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: Difference Engine No. 2 Description of subject: Difference Engine No. 2 is Charles Babbage’s later, more advanced mechanical calculating machine design, created in the 1840s to reliably compute and print mathematical tables.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.