Grammelogia, or, The mathematicall ring extracted from the logarythmes, and projected circular : now published in th[e] 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 extract on 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, horo[l]ogographic, geographie, fortification, navigation, astronomie, &c, and that onely by an ocular inspection, and a circular motion / invented an[d] first published, by R. Delamain, teacher, and student of the mathematicks.

CHARLES by the grace of God, King of Great Britaine, France, and Ireland, Defender of the Faith, &c.

To all our loving Subjects whom it may concerne greeting:

Whereas Richard Delamain, Teacher of the Mathematicks, hath presented vnto Vs an Instrument called Grammelogia, or The Mathe∣maticall Ring, together with a Booke so intituled, ex∣pressing the use thereof, being his owne Invention; We of our Gracious and Princely favour have granted unto the said Richard Delamain and his Assignes, Privilege, Licence, and Authority, for the sole Making, Printing, and Selling of the said Instrument and Booke: straight∣ly forbidding any other to Make, Imprint, or Sell, or cause to be Made, or Imprinted, or Sold, the said Instru∣ment or Booke within any our Dominions, during the space of ten yeares next ensuing the date hereof, upon paine of Our high displeasure.

Given under our hand and Signet at our Palace of Westminster, the fourth day of Ianuary, in the sixth yeare of our Raigne.