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.

By a Lover, and Student in the Mathe∣maticall Arts.

THrise noble Nepier by his learned straine, Invented profound numbers with great paine, From whence rare proiections doe arise, That praise their Author who did them devise, Which now againe, anew this Instrument Doth those his numbers quickly represent. And as the Orbes by motion alwayes shew Divers apparences which still are new, So infinit performances thereby Are pointed also out unto the eye, In multiplication, division, and Beside it makes you how to understand, To finde out meane proportionalls, that so, You may by sight of it proportions know. Besides all this, which is a thing more high, It helpes to worke in Trigonometry, Scorning Roots extracting, by partition, Or graduall numbers circuition: It equates regular figures, and doth show The solid bodies and the plaines also; Giving their sides, and perfect symmetrie, And speedily their true soliditie, Their circuits, and spheares will all appeare, Both circumscribed and inscribed here; Their Diameters and transmutations, In duplications and triplications. And as the Logarythmes did at first exceede, In their Inventions, all that did proceede, Or were before in any former age, So that which now this Author doth inlarge, Amongst these numbers is a worke of grace, By expeditious use for future race, In waightie things much to delight his mind, Who studious is the practike way to finde, If after ages seekes by Instrument to know, With greater ease makes ease excessive grow,