Rare Books

Grammelogia or, the mathematicall ring. : Extracted from the logarythmes, and projected circular: now published in the inlargement thereof unto any magnitude fit for use: shewing any reasonable capacity that hath not arithmeticke, how to resolve and worke, all ordinary operations of arithmeticke: and those that are most difficult with greatest facilitie, the extraction of rootes, the valuation of leases, &c. the measuring of plaines and solids, with the resolution of plaine and sphericall triangles applied to the practicall parts of geometrie, horologographie, geographie, fortification, navigation, astronomie, &c. And that onely by an ocular inspection, and a circular motion, invented and first published, by R. Delamain, teacher, and student of the mathematicks