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Mathematical Treasure: Gunter Quadrant

Frank J. Swetz (The Pennsylvania State University)

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


Frank J. Swetz (The Pennsylvania State University), "Mathematical Treasure: Gunter Quadrant," Convergence (May 2017)