French Brass Sector Compass Or Proportional Compass, 18th Century.
A two hinged arms with engraved scales — classic sector design.
Engravings like “Guides”, “Polygones”, and degree markings are mathematical/engineering scales.
The decorative pivot at the joint is typical of 18th century mathematical instruments. Made of brass, with hand-engraved numbers and script, not machine-etched. Made in Franch,
A sector was a calculation tool, used before calculators existed. Depending on the scales, it could be used for:
Geometry and trigonometry
Constructing polygons
Proportional scaling (maps, drawings, architecture)
Military and artillery calculations
Surveying and navigation
Engineers, architects, surveyors, and military officers commonly carried these.
In a used but very good state.
Dimensions:
long: 16,5 cm
wide: 2,9 cm
Thanks for visiting my shop, love and greetings Ben
Engravings like “Guides”, “Polygones”, and degree markings are mathematical/engineering scales.
The decorative pivot at the joint is typical of 18th century mathematical instruments. Made of brass, with hand-engraved numbers and script, not machine-etched. Made in Franch,
A sector was a calculation tool, used before calculators existed. Depending on the scales, it could be used for:
Geometry and trigonometry
Constructing polygons
Proportional scaling (maps, drawings, architecture)
Military and artillery calculations
Surveying and navigation
Engineers, architects, surveyors, and military officers commonly carried these.
In a used but very good state.
Dimensions:
long: 16,5 cm
wide: 2,9 cm
Thanks for visiting my shop, love and greetings Ben
245 €
Period: 18th century
Style: Other Style
Condition: Excellent condition
Material: Brass
Length: 16,5
Width: 2,9
Reference (ID): 1681438
Availability: In stock
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