Large brass rule with one bevelled edge. One face is completely used by a double-diagonal scale for inches, with 10x10 grids. Main scale is 0-34. Relative proportion is 2:1, with comparative subdivisions of 1:100 and 1:200. Other face has 36 inch rule, 0-36, with subdivisions of 1/20. Also on this face, a block of simply divided scales for parts/inch, a plain scale with lines of chords (3), rhumbs, lines, tangents, semi-tangents, longitudes, and 2 simply-divided scales for parts /10 inches.
