April 24, 2024
Antique Bone White Folding Sector Calculating, Mathematical, Nautical Rule.
Pricing & History
-
Sold for
Start Free Trial or Sign In to see what it's worth.
- Sold Date
- Source eBay
Here we have an Antique Bone White Folding Sector Calculating, Mathematical, Nautical Rule. There is no maker's mark on this rule. 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. A number of scales are inscribed upon the instrument which facilitate various mathematical calculations. It was used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots. Its several scales permitted easy and direct solutions of problems in gunnery, surveying and navigation. The overall condition of the White rule and the Brass hinge, is EXCELLENT with a nice white color. Typical very tiny short hairline cracks by the two pins near the hinge. Minor amount of very fine scratches here and there. All of the graduations and numbers are strong and dark. The hinge works as it should. Both of the alignment pins are present. All the legs line up as they should. No owners marks.** Please remember to leave Feedback . I will gladly reciprocate. :-)
Items in the Price Guide are obtained exclusively from licensors and partners solely for our members’ research needs.
If this item contains incorrect or inappropriate information please contact us here to flag it for review.
If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.
If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.
