Mathematical Treasure: Gunter Quadrant

This Gunter quadrant with its case is from seventeenth century Britain.

Constructed of rosewood, the quadrant has two loop sights on its vertical radius. A plumb bob is attached to the vertex of the quadrant. It probably was used as a land surveying aid.

This image is obtained through the courtesy of the Digital Public Library of America.

Index of Mathematical Treasures

Index of Mathematical Objects