A fine and very rare 18th century German sector in brass. Measures 7 inches/18 cm in length (closed) and opens on a three-leaf hinge. The faces bear various doubled scales including Arithm, Geomet, Cubica, and inch measure on one side, and two overlapping measures on the reverse. The scales were used for calculations in applied mathematics and engineering including gunnery, fortification design, surveying, navigation, plane and solid geometry, densities of ammunition materials, etc.
The front and reverse sides of the sector have different styles of engraving, with the reverse featuring the early German style punched numbers, especially evident in the “1”.
An important piece considering the rarity of early German sectors.
17cm closed, 33cm open
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Instrumentum specializes in high quality 17th and 18th century scientific instruments for architecture, mathematics and navigation. We have collected antique instruments for over 20 years with a focus on early and rare European architectural drafting sets, dividers, and rules. If you are interested in something particular please contact us at firstname.lastname@example.org. Image galleries of our inventory can be viewed on Pinterest and Facebook at the following links: