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IT is but a circle diuided in 360 grades or degrées, or a semicir•••• parted in 180 portions, and euery of those diuisiōs in 3 or rather 6 smaller partes, to it ye may adde the double scale, whose sin∣gle composition is mentioned. The sides of that scale diuided in 〈◊〉〈◊〉 60, or 100 parts. The index of that instrument with the sightes &c. are
not vnlike to that whiche the square hath: In his backe prepare a vice 〈◊〉〈◊〉 to be fastned in the top of some staffe if it be a circle as here: let you•• instrument be so large that from the centre to the degrées may be a 〈◊〉〈◊〉 in length, more if ye list, so shall you not erre in your practizes, the ba•••• side must be plaine and smooth to draw circles and lynes vppon, as shal 〈◊〉〈◊〉 declared: for a farther declaration of that I haue sayde, beholde thys fy••gure folowing.