bn:00070210n
Noun Concept
Categories: Mechanical calculators, Italian inventions, Galileo Galilei
EN
sector  military compass  proportional compass
EN
Measuring instrument consisting of two graduated arms hinged at one end WordNet 3.0
English:
instrument
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EN
Measuring instrument consisting of two graduated arms hinged at one end WordNet 3.0 & Open English WordNet
The sector, also known as a proportional compass or military compass, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. Wikipedia
A historic calculating instrument Wikipedia Disambiguation
Mechanical calculator Wikidata
An instrument consisting of two rulers of equal length joined by a hinge. Wiktionary
WordNet 3.0 & Open English WordNet
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Wikipedia
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