The arte of gunnerie. Wherein is set foorth a number of seruiceable secrets, and practical conclusions, belonging to the art of gunnerie, by arithmeticke skill to be accomplished: both pretie, pleasant, and profitable for all such as are professors of the same facultie. / Compiled by Thomas Smith of Barwicke vpon Tweed souldier.

An easie rule to find out the diameter of any bullet, and how to know how much one bullet is higher then another by Arithme∣ticke skill, without any cal∣laper compasses.

If you want a paire of callaper compasses, take a line or a garter &c. and gird the bullet or bullets whose height you desire iust in the mids, laying that measure to an inch rule, noting how many inches or other mea∣sure the same containeth, then multiplying the said mea∣sures by 7, and deuiding by 22, the quotient will shew you your request. And then abating the lesser diameter from the greater, the remaine will shew you how much the one is higher then the other.

Example.

Suppose the circumference of the one bullet be 16 inches, and the circumference of the other 26 inches, in working as aboue is taught, I find the diameter of the lesser bullet is 5 inches 1/11 and the diameter of the greater bullet 8 inches 4/11, so abating the lesser from the greater, the remaine is 3 inches and 3/11 partes of an inch, shewing the greater bullet is so much in height more then the lesser. The like is to be obserued with any other.

By this rule you may know how much the circumfe∣rence or any part of your peece is higher then another.