The practical gauger : arithmetical and instrumental: by lines commonly put on four-foot rules; usually made for the use of the officers in the duty of excise. With the full application thereof in whatsoever may concern a gauger in his geometrical affairs, for all sorts of close or open vessels. With plain directions to extract the square and cube-root by arithmetick. And the line of proportion made more easie and familiar to any capacity, than hitherto hath been. By John Brown.